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CVE-2026-114607— better-auth: OAuth state can be used as a Magic Link to sign in as another user

Quick assessment

Affected
better-auth better-auth
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Better Auth 是一个面向 TypeScript 的身份认证与授权库。在 1.4.0-beta.18 至 1.7.7 版本中，若部署同时满足以下条件：启用 Magic Link 并将 storeToken 设置为 plain，或将 storeToken 设置为 hashed 且全局配置 verification.storeIdentifier 也设置为 hashed；同时启用了内置的社交登录或通用 OAuth 提供商；并将 account.storeStateStrategy 设置为 database，则系

CVSS 9.1 · Critical

Affected Version Matrix 1

VendorProduct Version RangeStatus
better-auth better-auth >= 1.4.0-beta.18, < 1.7.7 affected
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I. Basic Information for CVE-2026-114607

Vulnerability Information
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Vulnerability Title
better-auth: OAuth state can be used as a Magic Link to sign in as another user
Source: CVE Program / CVE List V5
Vulnerability Description
Better Auth is an authentication and authorization library for TypeScript. From 1.4.0-beta.18 until 1.7.7, deployments that enable Magic Link with storeToken set to plain, or with storeToken set to hashed and the global verification.storeIdentifier setting also set to hashed, enable a built-in social or Generic OAuth provider, and use account.storeStateStrategy set to database can accept an OAuth sign-in state value as a Magic Link token. These settings can cause Magic Link verification records and OAuth state to resolve to the same stored identifier, allowing an unauthenticated attacker to start OAuth sign-in for a known email address and redeem the returned state through Magic Link without controlling the mailbox or completing the provider callback. The attacker can obtain a normal session for an existing user, or create an account incorrectly marked as email verified when sign-up is enabled. This issue is fixed in version 1.7.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
better-auth better-auth >= 1.4.0-beta.18, < 1.7.7 -

II. Public POCs for CVE-2026-114607

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III. Intelligence Information for CVE-2026-114607

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Patches & Fixes for CVE-2026-114607 (1)

Vendor Pages for CVE-2026-114607 (1)

Other References for CVE-2026-114607 (1)

IV. Related Vulnerabilities

Same product: better-auth
Same vendor: better-auth
Same weakness: CWE-287

V. Comments for CVE-2026-114607

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