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CVE-2026-53515
Better Auth: Privilege escalation via SSO provider registration: missing admin role check in @better-auth/sso
High7.1EPSS 0.43%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | High7.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N |
| NVDNVD · Analyzed | 3.1 | High7.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.43% · top 63% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
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The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Weakness
Affected products
- affected >= 1.2.10, < 1.6.11
- affected >= 1.2.10, < 1.6.11
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- npm@better-auth/ssoGHSA-gv74-j8m3-fg5f (opens in a new tab)
References (4)
- https://github.com/better-auth/better-auth/security/advisories/GHSA-gv74-j8m3-fg5f (opens in a new tab)x_refsource_CONFIRM
- https://github.com/better-auth/better-auth/pull/9220 (opens in a new tab)x_refsource_MISC
- https://github.com/better-auth/better-auth/commit/86765f1597378f5c3deed1b80ca91faac0a6bf00 (opens in a new tab)x_refsource_MISC
- https://github.com/better-auth/better-auth/releases/tag/v1.6.11 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-gv74-j8m3-fg5f (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-53515)Record last updated .