August 24, 2026

CVE Watchtower


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CVE-2026-53513NVD

Vulnerability Summary

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 Level
CRITICAL(9.6)
Published Date
Jul 15, 2026
Last Modified
Jul 21, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.19%Probability
Root Weakness (CWE)
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required.
CVSS v3.1 Base Metrics
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone