CVE WatchJul 21, 2026

CVE-2026-53513

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the @better-auth/sso plugin's POST /sso/register

CVSS

9.6

Critical

EPSS

0.2%

p16

KEV

—

Exploit Today

0-100

Published: Jul 15, 2026 · Last modified: Jul 21, 2026 · CWE-20 · CWE-345 · CWE-441

EPSS · 30d

0.2%EPSS · 30 days0.3%

2026-07-162026-07-22

Technical 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.

Official references

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