{"id":"CVE-2026-77582","title":"Tinyauth is an authentication and authorization server","summary":"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_contr…","severity":"medium","cvss":6.9,"cvssVector":"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","cwe":["CWE-208"],"vendor":"tinyauthapp","product":"tinyauth","affected":["tinyauth < 5.1.0"],"published":"2026-09-21","updated":"2026-09-21","sourceUpdated":"2026-09-21T17:18:53.110","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77582","references":[{"url":"https://github.com/tinyauthapp/tinyauth/commit/c22925c2fba981875d0a2b09dd3ee41c0ae4c310","label":"security-advisories@github.com"},{"url":"https://github.com/tinyauthapp/tinyauth/pull/1004","label":"security-advisories@github.com"},{"url":"https://github.com/tinyauthapp/tinyauth/releases/tag/v5.1.0","label":"security-advisories@github.com"},{"url":"https://github.com/tinyauthapp/tinyauth/security/advisories/GHSA-456h-ww26-f758","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"cvssSource":"cna","ingestedAt":"2026-09-21T16:49:07.865Z","slug":"CVE-2026-77582","body":"## Overview\n\nTinyauth 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":38,"depthScoreParts":{"impact":38,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}