CVE-2026-53513

CRITICAL

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

Title source: cna
STIX 2.1

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.

Scores

CVSS v3 9.6
EPSS 0.0025
EPSS Percentile 16.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-20 CWE-345 CWE-441 CWE-918
Status published
Products (5)
@better-auth/sso >= 0.1.0, < 1.6.11
better-auth/better-auth >= 0.1.0, < 1.6.11
better-auth/better-auth\/sso < 1.6.11
better-auth/better_auth 0.1.0 - 1.6.11
better-auth/sso 0.1.0 - 1.6.11npm
Published Jul 15, 2026
Tracked Since Jul 15, 2026