Auth bypass in @Better-auth Sso
CVE-2026-53515
Better Auth is an authentication and authorization library for TypeScript. From 1.2.10 until 1.6.11, the @better-auth/sso plugin's POST /sso/register endpoint lets any organization member attach a new SSO provider to that organization beca…
Vulnerability class: Privilege Escalation
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N.
Affected products
- @Better-auth Sso — versions >= 1.2.10, < 1.6.11
- Better-auth — versions >= 1.2.10, < 1.6.11
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-53515?
- CVE-2026-53515 is a high-severity vulnerability in @Better-auth Sso, classified under Improper Privilege Management. CVSS score: 7.1/10. Published 2026-07-15.
- How severe is CVE-2026-53515?
- High severity. CVSS v3 base score is 7.1 out of 10.