diff --git a/locales/index.d.ts b/locales/index.d.ts
index 8350297a79..1e5b142c58 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -5210,6 +5210,10 @@ export interface Locale extends ILocale {
      * ロックダウン
      */
     "lockdown": string;
+    /**
+     * アカウントを選択してください
+     */
+    "pleaseSelectAccount": string;
     "_accountSettings": {
         /**
          * コンテンツの表示にログインを必須にする
@@ -8448,10 +8452,18 @@ export interface Locale extends ILocale {
          * アプリケーションに戻っています
          */
         "callback": string;
+        /**
+         * アクセスを許可しました
+         */
+        "accepted": string;
         /**
          * アクセスを拒否しました
          */
         "denied": string;
+        /**
+         * 以下のユーザーとして操作しています
+         */
+        "scopeUser": string;
         /**
          * アプリケーションにアクセス許可を与えるには、ログインが必要です。
          */
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 93ed879a08..adb8fcf4ff 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -1298,6 +1298,7 @@ yourNameContainsProhibitedWords: "変更しようとした名前に禁止され
 yourNameContainsProhibitedWordsDescription: "名前に禁止されている文字列が含まれています。この名前を使用したい場合は、サーバー管理者にお問い合わせください。"
 thisContentsAreMarkedAsSigninRequiredByAuthor: "投稿者により、表示にはログインが必要と設定されています"
 lockdown: "ロックダウン"
+pleaseSelectAccount: "アカウントを選択してください"
 
 _accountSettings:
   requireSigninToViewContents: "コンテンツの表示にログインを必須にする"
@@ -2217,7 +2218,9 @@ _auth:
   permissionAsk: "このアプリは次の権限を要求しています"
   pleaseGoBack: "アプリケーションに戻ってやっていってください"
   callback: "アプリケーションに戻っています"
+  accepted: "アクセスを許可しました"
   denied: "アクセスを拒否しました"
+  scopeUser: "以下のユーザーとして操作しています"
   pleaseLogin: "アプリケーションにアクセス許可を与えるには、ログインが必要です。"
 
 _antennaSources:
diff --git a/packages/frontend/src/_boot_.ts b/packages/frontend/src/_boot_.ts
index 13a97e433c..c90cc6bdd0 100644
--- a/packages/frontend/src/_boot_.ts
+++ b/packages/frontend/src/_boot_.ts
@@ -12,7 +12,7 @@ import '@/style.scss';
 import { mainBoot } from '@/boot/main-boot.js';
 import { subBoot } from '@/boot/sub-boot.js';
 
-const subBootPaths = ['/share', '/auth', '/miauth', '/signup-complete'];
+const subBootPaths = ['/share', '/auth', '/miauth', '/oauth', '/signup-complete'];
 
 if (subBootPaths.some(i => location.pathname === i || location.pathname.startsWith(i + '/'))) {
 	subBoot();
diff --git a/packages/frontend/src/account.ts b/packages/frontend/src/account.ts
index f5a74a0581..36186ecac1 100644
--- a/packages/frontend/src/account.ts
+++ b/packages/frontend/src/account.ts
@@ -235,26 +235,6 @@ export async function openAccountMenu(opts: {
 }, ev: MouseEvent) {
 	if (!$i) return;
 
-	function showSigninDialog() {
-		const { dispose } = popup(defineAsyncComponent(() => import('@/components/MkSigninDialog.vue')), {}, {
-			done: (res: Misskey.entities.SigninFlowResponse & { finished: true }) => {
-				addAccount(res.id, res.i);
-				success();
-			},
-			closed: () => dispose(),
-		});
-	}
-
-	function createAccount() {
-		const { dispose } = popup(defineAsyncComponent(() => import('@/components/MkSignupDialog.vue')), {}, {
-			done: (res: Misskey.entities.SignupResponse) => {
-				addAccount(res.id, res.token);
-				switchAccountWithToken(res.token);
-			},
-			closed: () => dispose(),
-		});
-	}
-
 	async function switchAccount(account: Misskey.entities.UserDetailed) {
 		const storedAccounts = await getAccounts();
 		const found = storedAccounts.find(x => x.id === account.id);
@@ -323,10 +303,22 @@ export async function openAccountMenu(opts: {
 			text: i18n.ts.addAccount,
 			children: [{
 				text: i18n.ts.existingAccount,
-				action: () => { showSigninDialog(); },
+				action: () => {
+					getAccountWithSigninDialog().then(res => {
+						if (res != null) {
+							success();
+						}
+					});
+				},
 			}, {
 				text: i18n.ts.createAccount,
-				action: () => { createAccount(); },
+				action: () => {
+					getAccountWithSignupDialog().then(res => {
+						if (res != null) {
+							switchAccountWithToken(res.token);
+						}
+					});
+				},
 			}],
 		}, {
 			type: 'link',
@@ -347,6 +339,40 @@ export async function openAccountMenu(opts: {
 	});
 }
 
+export function getAccountWithSigninDialog(): Promise<{ id: string, token: string } | null> {
+	return new Promise((resolve) => {
+		const { dispose } = popup(defineAsyncComponent(() => import('@/components/MkSigninDialog.vue')), {}, {
+			done: async (res: Misskey.entities.SigninFlowResponse & { finished: true }) => {
+				await addAccount(res.id, res.i);
+				resolve({ id: res.id, token: res.i });
+			},
+			cancelled: () => {
+				resolve(null);
+			},
+			closed: () => {
+				dispose();
+			},
+		});
+	});
+}
+
+export function getAccountWithSignupDialog(): Promise<{ id: string, token: string } | null> {
+	return new Promise((resolve) => {
+		const { dispose } = popup(defineAsyncComponent(() => import('@/components/MkSignupDialog.vue')), {}, {
+			done: async (res: Misskey.entities.SignupResponse) => {
+				await addAccount(res.id, res.token);
+				resolve({ id: res.id, token: res.token });
+			},
+			cancelled: () => {
+				resolve(null);
+			},
+			closed: () => {
+				dispose();
+			},
+		});
+	});
+}
+
 if (_DEV_) {
 	(window as any).$i = $i;
 }
diff --git a/packages/frontend/src/components/MkAuthConfirm.stories.impl.ts b/packages/frontend/src/components/MkAuthConfirm.stories.impl.ts
new file mode 100644
index 0000000000..0adc44e204
--- /dev/null
+++ b/packages/frontend/src/components/MkAuthConfirm.stories.impl.ts
@@ -0,0 +1,7 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import MkAuthConfirm from './MkAuthConfirm.vue';
+void MkAuthConfirm;
diff --git a/packages/frontend/src/components/MkAuthConfirm.vue b/packages/frontend/src/components/MkAuthConfirm.vue
new file mode 100644
index 0000000000..c683364a6c
--- /dev/null
+++ b/packages/frontend/src/components/MkAuthConfirm.vue
@@ -0,0 +1,439 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div :class="$style.wrapper">
+	<Transition
+		mode="out-in"
+		:enterActiveClass="$style.transition_enterActive"
+		:leaveActiveClass="$style.transition_leaveActive"
+		:enterFromClass="$style.transition_enterFrom"
+		:leaveToClass="$style.transition_leaveTo"
+
+		:inert="_waiting"
+	>
+		<div v-if="phase === 'accountSelect'" key="accountSelect" :class="$style.root" class="_gaps">
+			<div :class="$style.header" class="_gaps_s">
+				<img v-if="icon" :class="$style.icon" :src="getProxiedImageUrl(icon)"/>
+				<div v-else :class="$style.iconFallback">
+					<i class="ti ti-user"></i>
+				</div>
+				<div :class="$style.headerText">{{ i18n.ts.pleaseSelectAccount }}</div>
+			</div>
+			<div :class="$style.accountSelectorRoot">
+				<div :class="$style.accountSelectorLabel">{{ i18n.ts.selectAccount }}</div>
+				<div :class="$style.accountSelectorList">
+					<template v-for="[id, user] in users">
+						<input type="radio" :id="'account-' + id" name="accountSelector" :value="id" v-model="selectedUser" :class="$style.accountSelectorRadio"/>
+						<label :for="'account-' + id" :class="$style.accountSelectorItem">
+							<MkAvatar :user="user" :class="$style.accountSelectorAvatar"/>
+							<div :class="$style.accountSelectorBody">
+								<MkUserName :user="user" :class="$style.accountSelectorName"/>
+								<MkAcct :user="user" :class="$style.accountSelectorAcct"/>
+							</div>
+						</label>
+					</template>
+					<button class="_button" :class="[$style.accountSelectorItem, $style.accountSelectorAddAccountRoot]" @click="clickAddAccount">
+						<div :class="[$style.accountSelectorAvatar, $style.accountSelectorAddAccountAvatar]">
+							<i class="ti ti-user-plus"></i>
+						</div>
+						<div :class="[$style.accountSelectorBody, $style.accountSelectorName]">{{ i18n.ts.addAccount }}</div>
+					</button>
+				</div>
+			</div>
+			<div class="_buttonsCenter">
+				<MkButton rounded gradate :disabled="selectedUser === null" @click="clickChooseAccount">{{ i18n.ts.continue }} <i class="ti ti-arrow-right"></i></MkButton>
+			</div>
+		</div>
+		<div v-else-if="phase === 'consent'" key="consent" :class="$style.root" class="_gaps">
+			<div :class="$style.header" class="_gaps_s">
+				<img v-if="icon" :class="$style.icon" :src="getProxiedImageUrl(icon)"/>
+				<div v-else :class="$style.iconFallback">
+					<i class="ti ti-apps"></i>
+				</div>
+				<div :class="$style.headerText">{{ name ? i18n.tsx._auth.shareAccess({ name }) : i18n.ts._auth.shareAccessAsk }}</div>
+			</div>
+			<div v-if="permissions && permissions.length > 0" class="_gaps_s" :class="$style.permissionRoot">
+				<div>{{ name ? i18n.tsx._auth.permission({ name }) : i18n.ts._auth.permissionAsk }}</div>
+				<ul :class="$style.permissionList">
+					<li v-for="p in permissions" :key="p">{{ i18n.ts._permissions[p] }}</li>
+				</ul>
+			</div>
+			<div :class="$style.accountSelectorRoot">
+				<div :class="$style.accountSelectorLabel">
+					{{ i18n.ts._auth.scopeUser }} <button class="_textButton" @click="clickBackToAccountSelect">{{ i18n.ts.switchAccount }}</button>
+				</div>
+				<div :class="$style.accountSelectorList">
+					<div :class="[$style.accountSelectorItem, $style.static]">
+						<MkAvatar :user="users.get(selectedUser!)!" :class="$style.accountSelectorAvatar"/>
+						<div :class="$style.accountSelectorBody">
+							<MkUserName :user="users.get(selectedUser!)!" :class="$style.accountSelectorName"/>
+							<MkAcct :user="users.get(selectedUser!)!" :class="$style.accountSelectorAcct"/>
+						</div>
+					</div>
+				</div>
+			</div>
+			<div class="_buttonsCenter">
+				<MkButton rounded @click="clickCancel">{{ i18n.ts.reject }}</MkButton>
+				<MkButton rounded gradate @click="clickAccept">{{ i18n.ts.accept }}</MkButton>
+			</div>
+		</div>
+		<div v-else-if="phase === 'success'" key="success" :class="$style.root" class="_gaps_s">
+			<div :class="$style.header" class="_gaps_s">
+				<div :class="$style.iconFallback">
+					<i class="ti ti-check"></i>
+				</div>
+				<div :class="$style.headerText">{{ i18n.ts._auth.accepted }}</div>
+				<div :class="$style.headerTextSub">{{ i18n.ts._auth.pleaseGoBack }}</div>
+			</div>
+		</div>
+		<div v-else-if="phase === 'denied'" key="denied" :class="$style.root" class="_gaps_s">
+			<div :class="$style.header" class="_gaps_s">
+				<div :class="$style.iconFallback">
+					<i class="ti ti-x"></i>
+				</div>
+				<div :class="$style.headerText">{{ i18n.ts._auth.denied }}</div>
+			</div>
+		</div>
+		<div v-else-if="phase === 'failed'" key="failed" :class="$style.root" class="_gaps_s">
+			<div :class="$style.header" class="_gaps_s">
+				<div :class="$style.iconFallback">
+					<i class="ti ti-x"></i>
+				</div>
+				<div :class="$style.headerText">{{ i18n.ts.somethingHappened }}</div>
+			</div>
+		</div>
+	</Transition>
+	<div v-if="_waiting" :class="$style.waitingRoot">
+		<MkLoading/>
+	</div>
+</div>
+</template>
+
+<script setup lang="ts">
+import { ref, computed } from 'vue';
+import * as Misskey from 'misskey-js';
+
+import MkButton from '@/components/MkButton.vue';
+
+import { $i, getAccounts, getAccountWithSigninDialog, getAccountWithSignupDialog } from '@/account.js';
+import { i18n } from '@/i18n.js';
+import * as os from '@/os.js';
+import { getProxiedImageUrl } from '@/scripts/media-proxy.js';
+import { misskeyApi } from '@/scripts/misskey-api.js';
+
+const props = defineProps<{
+	name?: string;
+	icon?: string;
+	permissions?: (typeof Misskey.permissions[number])[];
+	manualWaiting?: boolean;
+	waitOnDeny?: boolean;
+}>();
+
+const emit = defineEmits<{
+	(ev: 'accept', token: string): void;
+	(ev: 'deny', token: string): void;
+}>();
+
+const waiting = ref(true);
+const _waiting = computed(() => waiting.value || props.manualWaiting);
+const phase = ref<'accountSelect' | 'consent' | 'success' | 'denied' | 'failed'>('accountSelect');
+
+const selectedUser = ref<string | null>(null);
+
+const users = ref(new Map<string, Misskey.entities.UserDetailed & { token: string; }>());
+
+async function init() {
+	waiting.value = true;
+
+	users.value.clear();
+
+	if ($i) {
+		users.value.set($i.id, $i);
+	}
+
+	const accounts = await getAccounts();
+
+	const accountIdsToFetch = accounts.map(a => a.id).filter(id => !users.value.has(id));
+
+	if (accountIdsToFetch.length > 0) {
+		const usersRes = await misskeyApi('users/show', {
+			userIds: accountIdsToFetch,
+		});
+
+		for (const user of usersRes) {
+			if (users.value.has(user.id)) continue;
+
+			users.value.set(user.id, {
+				...user,
+				token: accounts.find(a => a.id === user.id)!.token,
+			});
+		}
+	}
+
+	waiting.value = false;
+}
+
+init();
+
+function clickAddAccount(ev: MouseEvent) {
+	selectedUser.value = null;
+
+	os.popupMenu([{
+		text: i18n.ts.existingAccount,
+		action: () => {
+			getAccountWithSigninDialog().then(async (res) => {
+				if (res != null) {
+					os.success();
+					await init();
+					if (users.value.has(res.id)) {
+						selectedUser.value = res.id;
+					}
+				}
+			});
+		},
+	}, {
+		text: i18n.ts.createAccount,
+		action: () => {
+			getAccountWithSignupDialog().then(async (res) => {
+				if (res != null) {
+					os.success();
+					await init();
+					if (users.value.has(res.id)) {
+						selectedUser.value = res.id;
+					}
+				}
+			});
+		},
+	}], ev.currentTarget ?? ev.target);
+}
+
+function clickChooseAccount() {
+	if (selectedUser.value === null) return;
+
+	phase.value = 'consent';
+}
+
+function clickBackToAccountSelect() {
+	selectedUser.value = null;
+	phase.value = 'accountSelect';
+}
+
+function clickCancel() {
+	if (selectedUser.value === null) return;
+
+	const user = users.value.get(selectedUser.value)!;
+
+	const token = user.token;
+
+	if (props.waitOnDeny) {
+		waiting.value = true;
+	}
+	emit('deny', token);
+}
+
+async function clickAccept() {
+	if (selectedUser.value === null) return;
+
+	const user = users.value.get(selectedUser.value)!;
+
+	const token = user.token;
+
+	waiting.value = true;
+	emit('accept', token);
+}
+
+function showUI(state: 'success' | 'denied' | 'failed') {
+	phase.value = state;
+	waiting.value = false;
+}
+
+defineExpose({
+	showUI,
+});
+</script>
+
+<style lang="scss" module>
+.transition_enterActive,
+.transition_leaveActive {
+	transition: opacity 0.3s cubic-bezier(0,0,.35,1), transform 0.3s cubic-bezier(0,0,.35,1);
+}
+.transition_enterFrom {
+	opacity: 0;
+	transform: translateX(50px);
+}
+.transition_leaveTo {
+	opacity: 0;
+	transform: translateX(-50px);
+}
+
+.wrapper {
+	overflow-x: hidden;
+	overflow-x: clip;
+
+	position: relative;
+	width: 100%;
+	height: 100%;
+}
+
+.waitingRoot {
+	position: absolute;
+	top: 0;
+	left: 0;
+	width: 100%;
+	height: 100%;
+	background-color: color-mix(in srgb, var(--MI_THEME-panel), transparent 50%);
+	display: flex;
+	justify-content: center;
+	align-items: center;
+	z-index: 1;
+	cursor: wait;
+}
+
+.root {
+	position: relative;
+	box-sizing: border-box;
+	width: 100%;
+	padding: 48px 24px;
+}
+
+.header {
+	margin: 0 auto;
+	max-width: 320px;
+}
+
+.icon,
+.iconFallback {
+	display: block;
+	margin: 0 auto;
+	width: 54px;
+	height: 54px;
+}
+
+.icon {
+	border-radius: 50%;
+	border: 1px solid var(--MI_THEME-divider);
+	background-color: #fff;
+	object-fit: contain;
+}
+
+.iconFallback {
+	border-radius: 50%;
+	background-color: var(--MI_THEME-accentedBg);
+	color: var(--MI_THEME-accent);
+	text-align: center;
+	line-height: 54px;
+	font-size: 18px;
+}
+
+.headerText,
+.headerTextSub {
+	text-align: center;
+	word-break: normal;
+	word-break: auto-phrase;
+}
+
+.headerText {
+	font-size: 16px;
+	font-weight: 700;
+}
+
+.permissionRoot {
+	padding: 16px;
+	border-radius: var(--MI-radius);
+	background-color: var(--MI_THEME-bg);
+}
+
+.permissionList {
+	margin: 0 0 0 1.5em;
+	padding: 0;
+}
+
+.accountSelectorLabel {
+	font-size: 0.85em;
+	opacity: 0.7;
+	margin-bottom: 8px;
+}
+
+.accountSelectorList {
+	border-radius: var(--MI-radius);
+	border: 1px solid var(--MI_THEME-divider);
+	overflow: hidden;
+	overflow: clip;
+}
+
+.accountSelectorRadio {
+	position: absolute;
+	clip: rect(0, 0, 0, 0);
+	pointer-events: none;
+
+	&:focus-visible + .accountSelectorItem {
+		outline: 2px solid var(--MI_THEME-accent);
+		outline-offset: -4px;
+	}
+
+	&:checked:focus-visible + .accountSelectorItem {
+		outline-color: #fff;
+	}
+
+	&:checked + .accountSelectorItem {
+		background: var(--MI_THEME-accent);
+		color: #fff;
+	}
+}
+
+.accountSelectorItem {
+	display: flex;
+	align-items: center;
+	padding: 8px;
+	font-size: 14px;
+	-webkit-tap-highlight-color: transparent;
+	cursor: pointer;
+
+	&:hover {
+		background: var(--MI_THEME-buttonHoverBg);
+	}
+
+	&.static {
+		cursor: unset;
+
+		&:hover {
+			background: none;
+		}
+	}
+}
+
+.accountSelectorAddAccountRoot {
+	width: 100%;
+}
+
+.accountSelectorBody {
+	padding: 0 8px;
+	min-width: 0;
+}
+
+.accountSelectorAvatar {
+	width: 45px;
+	height: 45px;
+}
+
+.accountSelectorAddAccountAvatar {
+	background-color: var(--MI_THEME-accentedBg);
+	color: var(--MI_THEME-accent);
+	font-size: 16px;
+	line-height: 45px;
+	text-align: center;
+	border-radius: 50%;
+}
+
+.accountSelectorName {
+	display: block;
+	font-weight: bold;
+}
+
+.accountSelectorAcct {
+	opacity: 0.5;
+}
+</style>
diff --git a/packages/frontend/src/components/MkModalWindow.vue b/packages/frontend/src/components/MkModalWindow.vue
index fe9e1ce088..f06cfffee4 100644
--- a/packages/frontend/src/components/MkModalWindow.vue
+++ b/packages/frontend/src/components/MkModalWindow.vue
@@ -26,11 +26,11 @@ import { onMounted, onUnmounted, shallowRef, ref } from 'vue';
 import MkModal from './MkModal.vue';
 
 const props = withDefaults(defineProps<{
-	withOkButton: boolean;
-	withCloseButton: boolean;
-	okButtonDisabled: boolean;
-	width: number;
-	height: number;
+	withOkButton?: boolean;
+	withCloseButton?: boolean;
+	okButtonDisabled?: boolean;
+	width?: number;
+	height?: number;
 }>(), {
 	withOkButton: false,
 	withCloseButton: true,
diff --git a/packages/frontend/src/components/MkSignupDialog.vue b/packages/frontend/src/components/MkSignupDialog.vue
index f240e6dc46..4f75a36fbe 100644
--- a/packages/frontend/src/components/MkSignupDialog.vue
+++ b/packages/frontend/src/components/MkSignupDialog.vue
@@ -8,7 +8,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 	ref="dialog"
 	:width="500"
 	:height="600"
-	@close="dialog?.close()"
+	@close="onClose"
 	@closed="$emit('closed')"
 >
 	<template #header>{{ i18n.ts.signup }}</template>
@@ -22,7 +22,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 			:leaveToClass="$style.transition_x_leaveTo"
 		>
 			<template v-if="!isAcceptedServerRule">
-				<XServerRules @done="isAcceptedServerRule = true" @cancel="dialog?.close()"/>
+				<XServerRules @done="isAcceptedServerRule = true" @cancel="onClose"/>
 			</template>
 			<template v-else>
 				<XSignup :autoSet="autoSet" @signup="onSignup" @signupEmailPending="onSignupEmailPending"/>
@@ -48,6 +48,7 @@ const props = withDefaults(defineProps<{
 
 const emit = defineEmits<{
 	(ev: 'done', res: Misskey.entities.SignupResponse): void;
+	(ev: 'cancelled'): void;
 	(ev: 'closed'): void;
 }>();
 
@@ -55,6 +56,11 @@ const dialog = shallowRef<InstanceType<typeof MkModalWindow>>();
 
 const isAcceptedServerRule = ref(false);
 
+function onClose() {
+	emit('cancelled');
+	dialog.value?.close();
+}
+
 function onSignup(res: Misskey.entities.SignupResponse) {
 	emit('done', res);
 	dialog.value?.close();
diff --git a/packages/frontend/src/pages/miauth.vue b/packages/frontend/src/pages/miauth.vue
index ffaf739ed0..eb33e7370e 100644
--- a/packages/frontend/src/pages/miauth.vue
+++ b/packages/frontend/src/pages/miauth.vue
@@ -4,95 +4,69 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<MkStickyContainer>
-	<template #header><MkPageHeader :actions="headerActions" :tabs="headerTabs"/></template>
-	<MkSpacer :contentMax="800">
-		<div v-if="$i">
-			<div v-if="state == 'waiting'">
-				<MkLoading/>
-			</div>
-			<div v-if="state == 'denied'">
-				<p>{{ i18n.ts._auth.denied }}</p>
-			</div>
-			<div v-else-if="state == 'accepted'" class="accepted">
-				<p v-if="callback">{{ i18n.ts._auth.callback }}<MkEllipsis/></p>
-				<p v-else>{{ i18n.ts._auth.pleaseGoBack }}</p>
-			</div>
-			<div v-else>
-				<div v-if="_permissions.length > 0">
-					<p v-if="name">{{ i18n.tsx._auth.permission({ name }) }}</p>
-					<p v-else>{{ i18n.ts._auth.permissionAsk }}</p>
-					<ul>
-						<li v-for="p in _permissions" :key="p">{{ i18n.ts._permissions[p] }}</li>
-					</ul>
-				</div>
-				<div v-if="name">{{ i18n.tsx._auth.shareAccess({ name }) }}</div>
-				<div v-else>{{ i18n.ts._auth.shareAccessAsk }}</div>
-				<div :class="$style.buttons">
-					<MkButton inline @click="deny">{{ i18n.ts.cancel }}</MkButton>
-					<MkButton inline primary @click="accept">{{ i18n.ts.accept }}</MkButton>
-				</div>
-			</div>
+<div>
+	<MkAnimBg style="position: fixed; top: 0;"/>
+	<div :class="$style.formContainer">
+		<div :class="$style.form">
+			<MkAuthConfirm
+				ref="authRoot"
+				:name="name"
+				:icon="icon || undefined"
+				:permissions="_permissions"
+				@accept="onAccept"
+				@deny="onDeny"
+			/>
 		</div>
-		<div v-else>
-			<p :class="$style.loginMessage">{{ i18n.ts._auth.pleaseLogin }}</p>
-			<MkSignin @login="onLogin"/>
-		</div>
-	</MkSpacer>
-</MkStickyContainer>
+	</div>
+</div>
 </template>
 
 <script lang="ts" setup>
-import { ref, computed } from 'vue';
-import MkSignin from '@/components/MkSignin.vue';
-import MkButton from '@/components/MkButton.vue';
+import { computed, useTemplateRef } from 'vue';
+import * as Misskey from 'misskey-js';
+import MkAnimBg from '@/components/MkAnimBg.vue';
 import { misskeyApi } from '@/scripts/misskey-api.js';
-import { $i, login } from '@/account.js';
-import { i18n } from '@/i18n.js';
 import { definePageMetadata } from '@/scripts/page-metadata.js';
+import MkAuthConfirm from '@/components/MkAuthConfirm.vue';
 
 const props = defineProps<{
 	session: string;
 	callback?: string;
-	name: string;
-	icon: string;
-	permission: string; // コンマ区切り
+	name?: string;
+	icon?: string;
+	permission?: string; // コンマ区切り
 }>();
 
-const _permissions = props.permission ? props.permission.split(',') : [];
+const _permissions = computed(() => {
+	return (props.permission ? props.permission.split(',').filter((p): p is typeof Misskey.permissions[number] => (Misskey.permissions as readonly string[]).includes(p)) : []);
+});
 
-const state = ref<string | null>(null);
+const authRoot = useTemplateRef('authRoot');
 
-async function accept(): Promise<void> {
-	state.value = 'waiting';
+async function onAccept(token: string) {
 	await misskeyApi('miauth/gen-token', {
 		session: props.session,
 		name: props.name,
 		iconUrl: props.icon,
-		permission: _permissions,
+		permission: _permissions.value,
+	}, token).catch(() => {
+		authRoot.value?.showUI('failed');
 	});
 
-	state.value = 'accepted';
-	if (props.callback) {
+	if (props.callback && props.callback !== '') {
 		const cbUrl = new URL(props.callback);
 		if (['javascript:', 'file:', 'data:', 'mailto:', 'tel:'].includes(cbUrl.protocol)) throw new Error('invalid url');
 		cbUrl.searchParams.set('session', props.session);
-		location.href = cbUrl.href;
+		location.href = cbUrl.toString();
+	} else {
+		authRoot.value?.showUI('success');
 	}
 }
 
-function deny(): void {
-	state.value = 'denied';
+function onDeny() {
+	authRoot.value?.showUI('denied');
 }
 
-function onLogin(res): void {
-	login(res.i);
-}
-
-const headerActions = computed(() => []);
-
-const headerTabs = computed(() => []);
-
 definePageMetadata(() => ({
 	title: 'MiAuth',
 	icon: 'ti ti-apps',
@@ -100,15 +74,24 @@ definePageMetadata(() => ({
 </script>
 
 <style lang="scss" module>
-.buttons {
-	margin-top: 16px;
-	display: flex;
-	gap: 8px;
-	flex-wrap: wrap;
+.formContainer {
+	min-height: 100svh;
+	padding: 32px 32px calc(env(safe-area-inset-bottom, 0px) + 32px) 32px;
+	box-sizing: border-box;
+	display: grid;
+	place-content: center;
 }
 
-.loginMessage {
-	text-align: center;
-	margin: 8px 0 24px;
+.form {
+	position: relative;
+	z-index: 10;
+	border-radius: var(--MI-radius);
+	background-color: var(--MI_THEME-panel);
+	box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
+	overflow: clip;
+	max-width: 500px;
+	width: 100vw;
+	height: min(80svh, calc(100svh - calc(env(safe-area-inset-bottom, 0px) + 64px)));
+	overflow-y: scroll;
 }
 </style>
diff --git a/packages/frontend/src/pages/oauth.vue b/packages/frontend/src/pages/oauth.vue
index 733e34eb2c..a6c84a385a 100644
--- a/packages/frontend/src/pages/oauth.vue
+++ b/packages/frontend/src/pages/oauth.vue
@@ -4,40 +4,28 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<MkStickyContainer>
-	<template #header><MkPageHeader/></template>
-	<MkSpacer :contentMax="800">
-		<div v-if="$i">
-			<div v-if="permissions.length > 0">
-				<p v-if="name">{{ i18n.tsx._auth.permission({ name }) }}</p>
-				<p v-else>{{ i18n.ts._auth.permissionAsk }}</p>
-				<ul>
-					<li v-for="p in permissions" :key="p">{{ i18n.ts._permissions[p] }}</li>
-				</ul>
-			</div>
-			<div v-if="name">{{ i18n.tsx._auth.shareAccess({ name }) }}</div>
-			<div v-else>{{ i18n.ts._auth.shareAccessAsk }}</div>
-			<form :class="$style.buttons" action="/oauth/decision" accept-charset="utf-8" method="post">
-				<input name="login_token" type="hidden" :value="$i.token"/>
-				<input name="transaction_id" type="hidden" :value="transactionIdMeta?.content"/>
-				<MkButton inline name="cancel" value="cancel">{{ i18n.ts.cancel }}</MkButton>
-				<MkButton inline primary>{{ i18n.ts.accept }}</MkButton>
-			</form>
+<div>
+	<MkAnimBg style="position: fixed; top: 0;"/>
+	<div :class="$style.formContainer">
+		<div :class="$style.form">
+			<MkAuthConfirm
+				ref="authRoot"
+				:name="name"
+				:permissions="permissions"
+				:waitOnDeny="true"
+				@accept="onAccept"
+				@deny="onDeny"
+			/>
 		</div>
-		<div v-else>
-			<p :class="$style.loginMessage">{{ i18n.ts._auth.pleaseLogin }}</p>
-			<MkSignin @login="onLogin"/>
-		</div>
-	</MkSpacer>
-</MkStickyContainer>
+	</div>
+</div>
 </template>
 
 <script lang="ts" setup>
-import MkSignin from '@/components/MkSignin.vue';
-import MkButton from '@/components/MkButton.vue';
-import { $i, login } from '@/account.js';
-import { i18n } from '@/i18n.js';
+import * as Misskey from 'misskey-js';
+import MkAnimBg from '@/components/MkAnimBg.vue';
 import { definePageMetadata } from '@/scripts/page-metadata.js';
+import MkAuthConfirm from '@/components/MkAuthConfirm.vue';
 
 const transactionIdMeta = document.querySelector<HTMLMetaElement>('meta[name="misskey:oauth:transaction-id"]');
 if (transactionIdMeta) {
@@ -45,10 +33,44 @@ if (transactionIdMeta) {
 }
 
 const name = document.querySelector<HTMLMetaElement>('meta[name="misskey:oauth:client-name"]')?.content;
-const permissions = document.querySelector<HTMLMetaElement>('meta[name="misskey:oauth:scope"]')?.content.split(' ') ?? [];
+const permissions = document.querySelector<HTMLMetaElement>('meta[name="misskey:oauth:scope"]')?.content.split(' ').filter((p): p is typeof Misskey.permissions[number] => (Misskey.permissions as readonly string[]).includes(p)) ?? [];
 
-function onLogin(res): void {
-	login(res.i);
+function doPost(token: string, decision: 'accept' | 'deny') {
+	const form = document.createElement('form');
+	form.action = '/oauth/decision';
+	form.method = 'post';
+	form.acceptCharset = 'utf-8';
+
+	const loginToken = document.createElement('input');
+	loginToken.type = 'hidden';
+	loginToken.name = 'login_token';
+	loginToken.value = token;
+	form.appendChild(loginToken);
+
+	const transactionId = document.createElement('input');
+	transactionId.type = 'hidden';
+	transactionId.name = 'transaction_id';
+	transactionId.value = transactionIdMeta?.content ?? '';
+	form.appendChild(transactionId);
+
+	if (decision === 'deny') {
+		const cancel = document.createElement('input');
+		cancel.type = 'hidden';
+		cancel.name = 'cancel';
+		cancel.value = 'cancel';
+		form.appendChild(cancel);
+	}
+
+	document.body.appendChild(form);
+	form.submit();
+}
+
+function onAccept(token: string) {
+	doPost(token, 'accept');
+}
+
+function onDeny(token: string) {
+	doPost(token, 'deny');
 }
 
 definePageMetadata(() => ({
@@ -58,15 +80,24 @@ definePageMetadata(() => ({
 </script>
 
 <style lang="scss" module>
-.buttons {
-	margin-top: 16px;
-	display: flex;
-	gap: 8px;
-	flex-wrap: wrap;
+.formContainer {
+	min-height: 100svh;
+	padding: 32px 32px calc(env(safe-area-inset-bottom, 0px) + 32px) 32px;
+	box-sizing: border-box;
+	display: grid;
+	place-content: center;
 }
 
-.loginMessage {
-	text-align: center;
-	margin: 8px 0 24px;
+.form {
+	position: relative;
+	z-index: 10;
+	border-radius: var(--MI-radius);
+	background-color: var(--MI_THEME-panel);
+	box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
+	overflow: clip;
+	max-width: 500px;
+	width: 100vw;
+	height: min(80svh, calc(100svh - calc(env(safe-area-inset-bottom, 0px) + 64px)));
+	overflow-y: scroll;
 }
 </style>
diff --git a/packages/frontend/src/pages/settings/accounts.vue b/packages/frontend/src/pages/settings/accounts.vue
index 1bbedb817e..16f0716a12 100644
--- a/packages/frontend/src/pages/settings/accounts.vue
+++ b/packages/frontend/src/pages/settings/accounts.vue
@@ -19,13 +19,13 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { defineAsyncComponent, ref, computed } from 'vue';
+import { ref, computed } from 'vue';
 import type * as Misskey from 'misskey-js';
 import FormSuspense from '@/components/form/suspense.vue';
 import MkButton from '@/components/MkButton.vue';
 import * as os from '@/os.js';
 import { misskeyApi } from '@/scripts/misskey-api.js';
-import { getAccounts, addAccount as addAccounts, removeAccount as _removeAccount, login, $i } from '@/account.js';
+import { getAccounts, removeAccount as _removeAccount, login, $i, getAccountWithSigninDialog, getAccountWithSignupDialog } from '@/account.js';
 import { i18n } from '@/i18n.js';
 import { definePageMetadata } from '@/scripts/page-metadata.js';
 import MkUserCardMini from '@/components/MkUserCardMini.vue';
@@ -74,23 +74,19 @@ async function removeAccount(account: Misskey.entities.UserDetailed) {
 }
 
 function addExistingAccount() {
-	const { dispose } = os.popup(defineAsyncComponent(() => import('@/components/MkSigninDialog.vue')), {}, {
-		done: async (res: Misskey.entities.SigninFlowResponse & { finished: true }) => {
-			await addAccounts(res.id, res.i);
+	getAccountWithSigninDialog().then((res) => {
+		if (res != null) {
 			os.success();
 			init();
-		},
-		closed: () => dispose(),
+		}
 	});
 }
 
 function createAccount() {
-	const { dispose } = os.popup(defineAsyncComponent(() => import('@/components/MkSignupDialog.vue')), {}, {
-		done: async (res: Misskey.entities.SignupResponse) => {
-			await addAccounts(res.id, res.token);
+	getAccountWithSignupDialog().then((res) => {
+		if (res != null) {
 			switchAccountWithToken(res.token);
-		},
-		closed: () => dispose(),
+		}
 	});
 }