CVE-2026-53515
HIGHBetter Auth: Privilege escalation via SSO provider registration: missing admin role check in @better-auth/sso
Title source: cnaDescription
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.
References (4)
Core 4
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/better-auth/better-auth/security/advisories/GHSA-gv74-j8m3-fg5f
X_Refsource_Misc x_refsource_misc
https://github.com/better-auth/better-auth/pull/9220
X_Refsource_Misc x_refsource_misc
https://github.com/better-auth/better-auth/commit/86765f1597378f5c3deed1b80ca91faac0a6bf00
X_Refsource_Misc x_refsource_misc
https://github.com/better-auth/better-auth/releases/tag/v1.6.11
Scores
CVSS v3
7.1
EPSS
0.0024
EPSS Percentile
15.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-269
CWE-285
CWE-863
Status
published
Products (5)
@better-auth/sso
>= 1.2.10, < 1.6.11
better-auth/better-auth
>= 1.2.10, < 1.6.11
better-auth/better-auth\/sso
< 1.6.11
better-auth/better_auth
1.2.10 - 1.6.11
better-auth/sso
1.2.10 - 1.6.11npm
Published
Jul 15, 2026
Tracked Since
Jul 15, 2026