CVE-2026-41427
7.1
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| better-auth | better-auth | >= 1.4.8-beta.7, < 1.6.5 | affected |
| better-auth | better-auth | >= 1.7.0-beta.0, <= 1.7.0-beta.1 | affected |
| better-auth | oauth-provider | >= 1.4.8-beta.7, < 1.6.5 | affected |
| better-auth | oauth-provider | >= 1.7.0-beta.0, <= 1.7.0-beta.1 | affected |
Weaknesses
- CWE-863: CWE-863: Incorrect Authorization
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
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