High severity7.1NVD Advisory· Published Jul 15, 2026· Updated Jul 21, 2026
CVE-2026-53515
CVE-2026-53515
Description
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
@better-auth/ssonpm | >= 1.2.10, < 1.6.11 | 1.6.11 |
Affected products
4cpe:2.3:a:better-auth:better-auth\/sso:*:*:*:*:*:node.js:*:*+ 1 more
- cpe:2.3:a:better-auth:better-auth\/sso:*:*:*:*:*:node.js:*:*range: <1.6.11
- (no CPE)range: 1.2.10 - 1.6.11
cpe:2.3:a:better-auth:better_auth:*:*:*:*:*:node.js:*:*+ 1 more
- cpe:2.3:a:better-auth:better_auth:*:*:*:*:*:node.js:*:*range: >=1.2.10,<1.6.11
- (no CPE)range: 1.2.10 - 1.6.11
Patches
Vulnerability mechanics
References
7- github.com/better-auth/better-auth/commit/86765f1597378f5c3deed1b80ca91faac0a6bf00nvdPatchWEB
- github.com/better-auth/better-auth/pull/9220nvdIssue TrackingPatchWEB
- github.com/advisories/GHSA-gv74-j8m3-fg5fghsaADVISORY
- github.com/better-auth/better-auth/security/advisories/GHSA-gv74-j8m3-fg5fnvdMitigationVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-53515ghsaADVISORY
- github.com/better-auth/better-auth/issues/9133ghsaWEB
- github.com/better-auth/better-auth/releases/tag/v1.6.11nvdRelease NotesWEB
News mentions
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