CVE-2026-41427
HIGH
MEDIUM
Priority: 0.02
BB Relevance:
64/100
Published: 2026-04-24
Modified: 2026-10-26
First seen: 2026-10-29
Status: active
Attack Surface
Network
Low Complexity
No Interaction
Integ. Impact
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
Low
UI:
None
S:
X
AT:
None
VC:
None
VI:
High
VA:
None
Description
Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.5, the clientPrivileges option documents a create action, but the OAuth client creation endpoints did not invoke the hook before persisting new clients. Deployments that configured clientPrivileges to restrict client registration were not actually restricted — any authenticated user could reach the create endpoints and register an OAuth client with attacker-chosen redirect URIs and metadata. This vulnerability is fixed in 1.6.5.
Weakness Classification (1)
Affected Software (4)
| Vendor | Product | Version |
|---|---|---|
| better-auth | better-auth\/oauth-provider | 1.4.9 – 1.6.5 |
| better-auth | better-auth\/oauth-provider | 1.4.8 |
| better-auth | better-auth\/oauth-provider | 1.4.8 |
| better-auth | better-auth\/oauth-provider | 1.7.0 |
References & Advisories (1)
Mitigation
Vendor Advisory