High 7.1Published Jul 15, 2026

CVE-2026-53515Better Auth: Privilege escalation via SSO provider registration: missing admin role check in @better-auth/sso

Updated under an hour ago (Oct 27, 2026, 7:23 PM ET)

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It affects better-auth and 3 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for better-auth

Exploited in the last 30 days

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 because registerSSOProvider checks only for a membership row and does not require an owner or admin role, allowing attacker-controlled OIDC or SAML providers to drive /sso/callback/{providerId} organization provisioning. This issue is fixed in version 1.6.11.

CVSS: 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Weakness (CWE): CWE-269, CWE-285, CWE-863
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

better-auth better-auth better_auth:better_auth (from the name)	from 1.2.10, < 1.6.11	CNA record
@better-auth sso better_auth:sso (from the name)	from 1.2.10, < 1.6.11	CNA record
better-auth better-auth/sso better-auth:better-auth/sso	before 1.6.11	NVD
better-auth better_auth better-auth:better_auth	from 1.2.10 before 1.6.11	NVD

References

References

https://github.com/better-auth/better-auth/security/advisories/GHSA-gv74-j8m3-fg5f	x-refsource-confirm, mitigation, vendor-advisory
https://github.com/better-auth/better-auth/pull/9220	x-refsource-misc, issue-tracking, patch
https://github.com/better-auth/better-auth/commit/86765f1597378f5c3deed1b80ca91faac0a6bf00	x-refsource-misc, patch
https://github.com/better-auth/better-auth/releases/tag/v1.6.11	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.