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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53513
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-15 18:16:47 UTC
Updated2026-07-21 15:39:52 UTC
DescriptionBetter 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.

Risk And Classification

Primary CVSS: v3.1 9.6 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

EPSS: 0.002520000 probability, percentile 0.166290000 (date 2026-07-21)

Problem Types: CWE-20 | CWE-345 | CWE-441 | CWE-918 | CWE-20 CWE-20: Improper Input Validation | CWE-345 CWE-345: Insufficient Verification of Data Authenticity | CWE-441 CWE-441: Unintended Proxy or Intermediary ('Confused Deputy') | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
3.1CNADECLARED9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Better-auth Better-auth/sso All All All All
Application Better-auth Better Auth All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Better-auth Better-auth affected >= 0.1.0, < 1.6.11 Not specified
CNA @better-auth Sso affected >= 0.1.0, < 1.6.11 Not specified

References

ReferenceSourceLinkTags
github.com/better-auth/better-auth/commit/37f60cb176cb53147da7dfd5ec15af... [email protected] github.com Patch
github.com/better-auth/better-auth/releases/tag/v1.6.11 [email protected] github.com Release Notes
github.com/better-auth/better-auth/pull/9574 [email protected] github.com Issue Tracking, Patch
github.com/better-auth/better-auth/security/advisories/GHSA-5rr4-8452-hf4v [email protected] github.com Mitigation, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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