Paper/Archive/CVE-2026-53513

CVE-2026-53513

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

EPSS 0.2%CVSS 9.6

critical.is priorityof 100

CVSS 9.6 (CNA)9.6 / 10 × 3028.8 Not in CISA KEV+300.0 EPSS percentile 16.2.162 × 203.2 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource

better-auth>= 0.1.0, < 1.6.11–CNA

sso>= 0.1.0, < 1.6.11–CNA

Scores by source

GitHub_M (CNA)9.6CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/better-auth/better-auth/security/advisories/GHSA-5rr4-8452-hf4v refgithub.com/better-auth/better-auth/pull/9574 refgithub.com/better-auth/better-auth/commit/37f60cb176cb53147da7dfd5ec15afa5b486e81e refgithub.com/better-auth/better-auth/releases/tag/v1.6.11