SSRF in @Better-Auth Sso
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 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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.002 (15.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- @Better-Auth Sso — versions >= 0.1.0, < 1.6.11
- Better-Auth — versions >= 0.1.0, < 1.6.11
- Better-Auth Better Auth
- Better-Auth Better-Auth\/sso
Weakness classification (CWE)
References
- github.com/better-auth/better-auth/security/advisories/GHSA-5rr4-8452-hf4v (Mitigation, Vendor Advisory)
- github.com/better-auth/better-auth/pull/9574 (Patch, Issue Tracking)
- github.com/better-auth/better-auth/commit/37f60cb176cb53147da7dfd5ec15afa5b486e… (Patch)
- github.com/better-auth/better-auth/releases/tag/v1.6.11 (Release Notes)
Frequently asked questions
- What is CVE-2026-53513?
- CVE-2026-53513 is a critical-severity vulnerability in @Better-Auth Sso, classified under Improper Input Validation. CVSS score: 9.6/10. Published 2026-07-15.
- How severe is CVE-2026-53513?
- Critical severity. CVSS v3 base score is 9.6 out of 10.