{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-27480","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-02-19T19:46:03.540Z","datePublished":"2026-02-21T09:14:30.376Z","dateUpdated":"2026-02-24T18:13:51.921Z"},"containers":{"cna":{"title":"Static Web Server: Timing-Based Username Enumeration in Basic Authentication","problemTypes":[{"descriptions":[{"cweId":"CWE-204","lang":"en","description":"CWE-204: Observable Response Discrepancy","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/static-web-server/static-web-server/security/advisories/GHSA-qhp6-635j-x7r2","tags":["x_refsource_CONFIRM"],"url":"https://github.com/static-web-server/static-web-server/security/advisories/GHSA-qhp6-635j-x7r2"},{"name":"https://github.com/static-web-server/static-web-server/commit/7bf0fd425eb10dac9bf9ef5febce12c4dd039ce1","tags":["x_refsource_MISC"],"url":"https://github.com/static-web-server/static-web-server/commit/7bf0fd425eb10dac9bf9ef5febce12c4dd039ce1"}],"affected":[{"vendor":"static-web-server","product":"static-web-server","versions":[{"version":">= 2.1.0, < 2.41.0","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-02-21T09:14:30.376Z"},"descriptions":[{"lang":"en","value":"Static Web Server (SWS) is a production-ready web server suitable for static web files or assets. In versions 2.1.0 through 2.40.1, a timing-based username enumeration vulnerability in Basic Authentication allows attackers to identify valid users by exploiting early responses for invalid usernames, enabling targeted brute-force or credential-stuffing attacks. SWS checks whether a username exists before verifying the password, causing valid usernames to follow a slower code path (e.g., bcrypt hashing) while invalid usernames receive an immediate 401 response. This timing discrepancy allows attackers to enumerate valid accounts by measuring response-time differences. This issue has been fixed in version 2.41.0."}],"source":{"advisory":"GHSA-qhp6-635j-x7r2","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-24T18:13:36.026175Z","id":"CVE-2026-27480","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-02-24T18:13:51.921Z"}}]}}