CVE-2026-77582

published 2026-09-21

CVE-2026-77582: Tinyauth is an authentication and authorization server. Prior to 5.1.0, Tinyauth exposes a remotely observable timing difference between authentication…

Priority P3 45 medium 6.9 CVSS 4.0

AV N AC L AT N PR N UI N VC L VI N VA N SC N SI N 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

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

2 ranges

Vendor	Product	Version range	Fixed in
github.com	tinyauthapp_tinyauth	>= 0 < 1.0.1-0.20260714134959-c22925c2fba9	1.0.1-0.20260714134959-c22925c2fba9
tinyauthapp	tinyauth	< 5.1.0	5.1.0

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CWE-208