{"cve":"CVE-2026-77582","nvd":{"published":"2026-09-21T17:18:53.110","modified":"2026-09-30T17:32:07.107","status":"Deferred","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.","cvss_v4":{"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","score":6.9},"cvss_v3":null,"cwes":["CWE-208"],"references":["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"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:55:23.253742848+00:00"},"epss":{"cve":"CVE-2026-77582","score":0.00626,"percentile":0.49694,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-456h-ww26-f758","url":"https://osv.dev/vulnerability/GHSA-456h-ww26-f758","summary":"Tinyauth: User enumeration attack by timing oracle","modified":"2026-10-01T20:56:17.798738861Z","packages":[{"ecosystem":"Go","name":"github.com/tinyauthapp/tinyauth","purl":"pkg:golang/github.com/tinyauthapp/tinyauth","ranges":["<1.0.1-0.20260714134959-c22925c2fba9"],"fixed":["1.0.1-0.20260714134959-c22925c2fba9"]}]},{"id":"GO-2026-6555","url":"https://osv.dev/vulnerability/GO-2026-6555","summary":"Tinyauth: User enumeration attack by timing oracle in github.com/tinyauthapp/tinyauth","modified":"2026-10-01T20:45:12.223797805Z","packages":[{"ecosystem":"Go","name":"github.com/tinyauthapp/tinyauth","purl":"pkg:golang/github.com/tinyauthapp/tinyauth","ranges":["<1.0.1-0.20260714134959-c22925c2fba9"],"fixed":["1.0.1-0.20260714134959-c22925c2fba9"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}