CVE-2026-63438

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{"affected": [{"affectedData": [{"product": "2FAuth", "vendor": "Bubka", "versions": [{"status": "affected", "version": "< 8.0.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "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."}], "id": "CVE-2026-63438", "lastModified": "2026-11-12T22:18:51.470", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-63438", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-11-10T20:08:40.376272Z", "version": "2.0.3"}}]}, "published": "2026-11-06T21:17:09.770", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/Bubka/2FAuth/commit/43873cbfba445926c7008b4291eeee67752af9e8"}, {"source": "security-advisories@github.com", "url": "https://github.com/Bubka/2FAuth/commit/8a4c395cac97f8b70b4a822639a6ad8a816f927c"}, {"source": "security-advisories@github.com", "url": "https://github.com/Bubka/2FAuth/commit/d9e58ac4a63fbd8a073e423567881c81a87915de"}, {"source": "security-advisories@github.com", "url": "https://github.com/Bubka/2FAuth/releases/tag/v8.0.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/Bubka/2FAuth/security/advisories/GHSA-r9xx-45m8-mw24"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/Bubka/2FAuth/security/advisories/GHSA-r9xx-45m8-mw24"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-287"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,8.0.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "2FAuth", "source": "cna", "vendor": "Bubka"}, "product": "2fauth", "vendor": "bubka"}], "created": "2026-11-06T21:38:31.634197+00:00", "updated": "2026-11-06T22:15:07.338068+00:00", "vendors": ["bubka", "bubka$PRODUCT$2fauth"]}