CVE-2026-33544 | BDVDB-2026-324398 Detail

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.

Impact#

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Exploit#

History#

1. Version 12026-04-02Record published in the CVE List.
2. Version 22026-04-03Most recent update recorded in the CVE List.