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CVE-2026-53516— Better Auth: Account takeover via OAuth auto-link to unverified pre-registered email

Quick assessment

Affected
better-auth better-auth
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

better-auth better-auth是better-auth的防病毒反病毒产品。 Better Auth 1.6.11之前版本存在安全漏洞，该漏洞源于OAuth回调自动链接门在handleOAuthUserInfo中接受隐式账户链接，当OAuth提供者断言email_verified为true时，无需本地用户行的emailVerified字段也为true，允许攻击者通过/sign-up/email预先注册受害者电子邮件，将受害者的OAuth身份绑定到攻击者的账户。

CVSS 8.3 · High EPSS 0.29% · P22

Affected Version Matrix 1

VendorProduct Version RangeStatus
better-auth better-auth < 1.6.11 affected
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I. Basic Information for CVE-2026-53516

Vulnerability Information
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Vulnerability Title
Better Auth: Account takeover via OAuth auto-link to unverified pre-registered email
Source: CVE Program / CVE List V5
Vulnerability Description
Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, Better Auth's OAuth callback auto-link gate in handleOAuthUserInfo accepts implicit account linking when the OAuth provider asserts email_verified: true without requiring the local user row's emailVerified field to also be true, allowing an attacker who pre-registers a victim email through /sign-up/email to bind the victim's OAuth identity to the attacker's account. The same primitive affects one-tap, and emailAndPassword.requireEmailVerification: true does not mitigate the link-time verification change. This issue is fixed in version 1.6.11.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Better Auth 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
better-auth better-auth是better-auth的防病毒反病毒产品。 Better Auth 1.6.11之前版本存在安全漏洞，该漏洞源于OAuth回调自动链接门在handleOAuthUserInfo中接受隐式账户链接，当OAuth提供者断言email_verified为true时，无需本地用户行的emailVerified字段也为true，允许攻击者通过/sign-up/email预先注册受害者电子邮件，将受害者的OAuth身份绑定到攻击者的账户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
better-auth better-auth < 1.6.11 -

II. Public POCs for CVE-2026-53516

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 13816 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-53516

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Patches & Fixes for CVE-2026-53516 (1)

Vendor Advisories for CVE-2026-53516 (1)

Vendor Pages for CVE-2026-53516 (1)

Same Patch Batch · better-auth · 2026-07-15 · 8 CVEs total

CVE-2026-53513 9.6 CRITICAL Better Auth: Server-side request forgery via unvalidated OIDC endpoints on @better-auth/ss
CVE-2026-53517 8.1 HIGH Better Auth OAuth Provider: Refresh Token Rotation Race Condition Allows Concurrent Replay
CVE-2026-53514 7.7 HIGH Better Auth: Unauthorized invitation acceptance via unverified email match in organization
CVE-2026-45337 7.6 HIGH Better Auth: Device authorization approve and deny accept any authenticated session while
CVE-2026-53515 7.1 HIGH Better Auth: Privilege escalation via SSO provider registration: missing admin role check
CVE-2026-53518 Better Auth OAuth Provider: Race Condition in Authorization Code Exchange Enables Multi-Us
CVE-2026-53512 Better Auth: OAuth refresh-token replay via missing client authentication on oidc-provider

IV. Related Vulnerabilities

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