CVEvulnerability
CVE-2026-33544
7.7 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-04-02
- Last modified
- 2026-10-26
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.7 HIGH — CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
- Weaknesses
- CWE-362
Description
Tinyauth is an authentication and authorization server. Prior to version 5.0.5, all three OAuth service implementations (GenericOAuthService, GithubOAuthService, GoogleOAuthService) store PKCE verifiers and access tokens as mutable struct fields on singleton instances shared across all concurrent requests. When two users initiate OAuth login for the same provider concurrently, a race condition between VerifyCode() and Userinfo() causes one user to receive a session with the other user's identity. This issue has been patched in version 5.0.5.
Affected configurations
• tinyauth tinyauth (< 5.0.5)
Related
Weakness · CWE (1)
- CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization weakness
References
- https://github.com/steveiliop56/tinyauth/commit/f26c2171610d5c2dfbba2edb6ccd39490e349803 Patch
- https://github.com/steveiliop56/tinyauth/releases/tag/v5.0.5 Product, Release Notes
- https://github.com/steveiliop56/tinyauth/security/advisories/GHSA-9q5m-jfc4-wc92 Exploit, Mitigation, Vendor Advisory