Vulnerability details

CVE-2026-53513

better-auth better-authbetter-auth sso

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

CVSS 3.1

9.6Critical

Official 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.

CVSS scores

Score	Version	Source	Vector
9.6Critical	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N`

Affected products

Vendor	Product	Versions	Source
better-auth	better-auth	>= 0.1.0, < 1.6.11	CVEProject cvelistV5 (CNA)
better-auth	sso	>= 0.1.0, < 1.6.11	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/better-auth/better-auth/security/advisories/GHSA-5rr4-8452-hf4v x_refsource_CONFIRM
https://github.com/better-auth/better-auth/pull/9574 x_refsource_MISC
https://github.com/better-auth/better-auth/commit/37f60cb176cb53147da7dfd5ec15afa5b486e81e x_refsource_MISC
https://github.com/better-auth/better-auth/releases/tag/v1.6.11 x_refsource_MISC

Alerts for this product's next CVEsFollow the product to get new vulnerabilities on Telegram.

Details

Published: 2026-07-15
Last updated: 2026-07-15
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.24%

Probability of exploitation in 30 days

16.1%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

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