{"id":"CVE-2026-77582","state":"PUBLISHED","title":"Tinyauth: User enumeration attack by timing oracle","description":"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.","publishedAt":"2026-09-21T16:43:43.175Z","updatedAt":"2026-09-23T19:16:39.000Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"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","source":"GitHub_M"},"assigner":"GitHub_M","products":["tinyauthapp tinyauth"],"affected":[{"vendor":"tinyauthapp","product":"tinyauth","versions":[{"version":"< 5.1.0","status":"affected"}]}],"references":["https://github.com/tinyauthapp/tinyauth/security/advisories/GHSA-456h-ww26-f758","https://github.com/tinyauthapp/tinyauth/pull/1004","https://github.com/tinyauthapp/tinyauth/commit/c22925c2fba981875d0a2b09dd3ee41c0ae4c310","https://github.com/tinyauthapp/tinyauth/releases/tag/v5.1.0"],"weaknesses":["CWE-208"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/77xxx/CVE-2026-77582.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-77582","state":"PUBLISHED","datePublished":"2026-09-21T16:43:43.175Z","dateUpdated":"2026-09-23T19:16:39.000Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-20T20:35:30.148Z"},"containers":{"cna":{"title":"Tinyauth: User enumeration attack by timing oracle","descriptions":[{"lang":"en","value":"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":[{"vendor":"tinyauthapp","product":"tinyauth","versions":[{"version":"< 5.1.0","status":"affected"}]}],"references":[{"url":"https://github.com/tinyauthapp/tinyauth/security/advisories/GHSA-456h-ww26-f758","name":"https://github.com/tinyauthapp/tinyauth/security/advisories/GHSA-456h-ww26-f758","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/tinyauthapp/tinyauth/pull/1004","name":"https://github.com/tinyauthapp/tinyauth/pull/1004","tags":["x_refsource_MISC"]},{"url":"https://github.com/tinyauthapp/tinyauth/commit/c22925c2fba981875d0a2b09dd3ee41c0ae4c310","name":"https://github.com/tinyauthapp/tinyauth/commit/c22925c2fba981875d0a2b09dd3ee41c0ae4c310","tags":["x_refsource_MISC"]},{"url":"https://github.com/tinyauthapp/tinyauth/releases/tag/v5.1.0","name":"https://github.com/tinyauthapp/tinyauth/releases/tag/v5.1.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6.9,"baseSeverity":"MEDIUM","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-208","lang":"en","description":"CWE-208: Observable Timing Discrepancy","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-21T16:43:43.175Z"},"source":{"advisory":"GHSA-456h-ww26-f758","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/tinyauthapp/tinyauth/security/advisories/GHSA-456h-ww26-f758","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-23T19:16:31.589447Z","id":"CVE-2026-77582","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-23T19:16:39.000Z"}}]}}}