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

Weakness classification (CWE)

References

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.