CVSS 3.1
9.6 criticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:NCVE-2026-53513
Critical (9.6) in better-auth. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in @better-auth/sso 1.6.11.
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.
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 16% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-20, CWE-345, CWE-441, CWE-918
- Published
- Modified
- Record from
- the NVD, synced
Affected
- better-auth:better-auth\/sso
- better-auth:better_auth
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-5rr4-8452-hf4v | npm | @better-auth/sso | >=0.1.0 <1.6.11 | 1.6.11 |