Critical 9.6Published Jul 15, 2026

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

Updated under an hour ago (Oct 27, 2026, 12:30 AM ET)

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It affects better-auth and 3 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 9.6 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Weakness (CWE): CWE-20, CWE-345, CWE-441, CWE-918
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

better-auth better-auth better_auth:better_auth (from the name)	from 0.1.0, < 1.6.11	CNA record
@better-auth sso better_auth:sso (from the name)	from 0.1.0, < 1.6.11	CNA record
better-auth better-auth/sso better-auth:better-auth/sso	before 1.6.11	NVD
better-auth better_auth better-auth:better_auth	from 0.1.0 before 1.6.11	NVD

References

References

https://github.com/better-auth/better-auth/security/advisories/GHSA-5rr4-8452-hf4v	x-refsource-confirm, mitigation, vendor-advisory
https://github.com/better-auth/better-auth/pull/9574	x-refsource-misc, issue-tracking, patch
https://github.com/better-auth/better-auth/commit/37f60cb176cb53147da7dfd5ec15afa5b486e81e	x-refsource-misc, patch
https://github.com/better-auth/better-auth/releases/tag/v1.6.11	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.