CVE-2026-41427
Last modified
CVE-2026-41427 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.21% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
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
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| 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 | 1.7.0 | Beta0 |
References
- https://github.com/better-auth/better-auth/security/advisories/GHSA-xr8f-h2gw-9xh6Mitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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