CVE-2026-77582

Tinyauth is an authentication and authorization server. Prior to 5.1.0, Tinyauth exposes a remotely observable timing difference between authentication attempts for existing and nonexistent local usernames. internal/controller/user_controller.go loginHandler and internal/middleware/context_middleware.go basicAuth return quickly after internal/service/auth_service.go reports a missing user, while an existing user causes bcrypt password verification work. Repeated measurements can therefore disclose valid usernames and support targeted credential attacks. This issue is fixed in version 5.1.0.

• https://github.com/tinyauthapp/tinyauth/commit/c22925c2fba981875d0a2b09dd3ee41c0ae4c310
• https://github.com/tinyauthapp/tinyauth/pull/1004
• https://github.com/tinyauthapp/tinyauth/releases/tag/v5.1.0
• https://github.com/tinyauthapp/tinyauth/security/advisories/GHSA-456h-ww26-f758
• https://github.com/tinyauthapp/tinyauth/security/advisories/GHSA-456h-ww26-f758