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CVE-2026-53513— Better Auth: Server-side request forgery via unvalidated OIDC endpoints on @better-auth/sso provider registration

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个人开发者开源的一个框架无关认证框架。 Better Auth 1.6.11之前版本存在安全漏洞，该漏洞源于输入验证错误，当设置skipDiscovery: true时，@better-auth/sso插件接受攻击者控制的oidcConfig.userInfoEndpoint、tokenEndpoint和jwksEndpoint URLs，存储时未进行来源验证，并在OIDC回调时调用，可能导致非盲服务端请求伪造，当配置trustEmai

CVSS 9.6 · Critical EPSS 0.25% · P15

Affected Version Matrix 2

VendorProduct Version RangeStatus
@better-auth sso >= 0.1.0, < 1.6.11 affected
better-auth better-auth >= 0.1.0, < 1.6.11 affected
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I. Basic Information for CVE-2026-53513

Vulnerability Information
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Vulnerability Title
Better Auth: Server-side request forgery via unvalidated OIDC endpoints on @better-auth/sso provider registration
Source: CVE Program / CVE List V5
Vulnerability Description
Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the @better-auth/sso plugin's POST /sso/register and POST /sso/update-provider endpoints accept attacker-controlled oidcConfig.userInfoEndpoint, tokenEndpoint, and jwksEndpoint URLs when skipDiscovery: true is set, store them on the ssoProvider row without origin validation, and fetch them during OIDC callback, allowing non-blind server-side request forgery and possible account linking when trustEmailVerified: true is configured. 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:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Better Auth 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
better-auth Better Auth是better-auth个人开发者开源的一个框架无关认证框架。 Better Auth 1.6.11之前版本存在安全漏洞，该漏洞源于输入验证错误，当设置skipDiscovery: true时，@better-auth/sso插件接受攻击者控制的oidcConfig.userInfoEndpoint、tokenEndpoint和jwksEndpoint URLs，存储时未进行来源验证，并在OIDC回调时调用，可能导致非盲服务端请求伪造，当配置trustEmai
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 >= 0.1.0, < 1.6.11 -
@better-auth sso >= 0.1.0, < 1.6.11 -

II. Public POCs for CVE-2026-53513

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7683 chars
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III. Intelligence Information for CVE-2026-53513

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Patches & Fixes for CVE-2026-53513 (1)

Vendor Advisories for CVE-2026-53513 (1)

Vendor Pages for CVE-2026-53513 (1)

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

CVE-2026-53516 8.3 HIGH Better Auth: Account takeover via OAuth auto-link to unverified pre-registered email
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-20

V. Comments for CVE-2026-53513

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