CVE-2026-41427
HIGH EPSS 11.5%
Published Apr 24, 20262mo ago · Modified Jun 17, 20262w ago
7.1 CVSS 4.0
Published Apr 24, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X
Threat Intelligence
EPSS Exploit Probability
11.5% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-863 Incorrect Authorization Authorization
Affected Products 4
| Vendor | Product | Version | Range |
|---|---|---|---|
| better-auth | better-auth\/oauth-provider | * | ≥1.4.9 – <1.6.5 |
| better-auth | better-auth\/oauth-provider | 1.4.8 | any |
| better-auth | better-auth\/oauth-provider | 1.4.8 | any |
| better-auth | better-auth\/oauth-provider | 1.7.0 | any |
References 1
- github.com https://github.com/better-auth/better-auth/security/advisories/GHSA-xr8f-h2gw-9xh6
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.