{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63438","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-07-16T19:35:57.767Z","datePublished":"2026-11-06T20:20:27.407Z","dateUpdated":"2026-11-06T20:20:27.407Z"},"containers":{"cna":{"title":"2FAuth: Reverse Proxy Guard Auto-Creates Users With Admin Promotion From Unauthenticated Header Value","problemTypes":[{"descriptions":[{"cweId":"CWE-287","lang":"en","description":"CWE-287: Improper Authentication","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"name":"https://github.com/Bubka/2FAuth/security/advisories/GHSA-r9xx-45m8-mw24","tags":["x_refsource_CONFIRM"],"url":"https://github.com/Bubka/2FAuth/security/advisories/GHSA-r9xx-45m8-mw24"},{"name":"https://github.com/Bubka/2FAuth/commit/43873cbfba445926c7008b4291eeee67752af9e8","tags":["x_refsource_MISC"],"url":"https://github.com/Bubka/2FAuth/commit/43873cbfba445926c7008b4291eeee67752af9e8"},{"name":"https://github.com/Bubka/2FAuth/commit/8a4c395cac97f8b70b4a822639a6ad8a816f927c","tags":["x_refsource_MISC"],"url":"https://github.com/Bubka/2FAuth/commit/8a4c395cac97f8b70b4a822639a6ad8a816f927c"},{"name":"https://github.com/Bubka/2FAuth/commit/d9e58ac4a63fbd8a073e423567881c81a87915de","tags":["x_refsource_MISC"],"url":"https://github.com/Bubka/2FAuth/commit/d9e58ac4a63fbd8a073e423567881c81a87915de"},{"name":"https://github.com/Bubka/2FAuth/releases/tag/v8.0.0","tags":["x_refsource_MISC"],"url":"https://github.com/Bubka/2FAuth/releases/tag/v8.0.0"}],"affected":[{"vendor":"Bubka","product":"2FAuth","versions":[{"version":"< 8.0.0","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-11-06T20:20:27.407Z"},"descriptions":[{"lang":"en","value":"2FAuth is a web app to manage Two-Factor Authentication (2FA) accounts and generate their security codes. Prior to 8.0.0, when AUTHENTICATION_GUARD=reverse-proxy-guard accepts authentication headers from a client that did not pass through a trusted proxy, RemoteUserProvider::retrieveById() creates an account for an unknown REMOTE_USER, promotes the first created account to administrator, and synchronizes the account email from the configured mail header. An unauthenticated remote client can therefore create an administrator on a fresh instance or impersonate and redirect email for a known account, exposing 2FA secrets and administrative functions. This issue is fixed in version 8.0.0."}],"source":{"advisory":"GHSA-r9xx-45m8-mw24","discovery":"UNKNOWN"}}}}