CVE-2026-77582: Tinyauthapp Tinyauth

Medium severity, CVSS 6.9. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Tinyauthapp Tinyauth: before 5.1.0 (fixed in 5.1.0)

Published 2026-09-21. Last modified 2026-09-30.