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The passkey verification path performs a global credential lookup without validating that the matched credential belongs to the user whose login is pending, enabling an attacker who knows a target account's password to sign the challenge with their own passkey and bypass multi-factor authentication on both public forum and ACP login paths.","state":0,"publishedAt":"2026-09-08T13:17:30.351+00:00","modifiedAt":"2026-10-01T15:20:34.049+00:00","affected":[{"ecosystem":"Vendor product","name":"XenForo","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"vendor\": \"XenForo\",\n                    \"product\": \"XenForo\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"2.3.13\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","score":7.6,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","score":6.8,"severity":"MEDIUM"}],"references":["https://xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/","https://xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/","https://bombobombone.github.io/posts/cve-2026-73313/","https://github.com/BomboBombone/CVE-2026-73313","https://www.vulncheck.com/advisories/xenforo-mfa-bypass-via-passkey-tfa-provider"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-73313","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-73313","identifiers":["CVE-2026-73313"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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