{"id":"CVE-2026-84831","title":"Mandatory MFA bypass before enrollment","summary":"SEPPmail Secure Email Gateway before 15.0.7 creates a fully privileged session before required multi-factor authentication enrollment is completed. An attacker with the password for an MFA-required but unenrolled account can access prote…","severity":"high","cvss":7.7,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","cvssSource":"cna","cwe":["CWE-287","CWE-306"],"vendor":"SEPPmail AG","product":"SEPPmail Secure Email Gateway (SEG)","affected":["seppmail_secure_email_gateway_seg < 15.0.7"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-03T12:34:12.211918Z"},"published":"2026-09-03","updated":"2026-10-08","sourceUpdated":"2026-10-08T11:15:21.076Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-84831","references":[{"url":"https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html"}],"tags":["cve.org"],"epss":0.0047,"epssPercentile":0.38618,"ingestedAt":"2026-10-08T11:31:27.692Z","slug":"CVE-2026-84831","body":"## Overview\n\nSEPPmail Secure Email Gateway before 15.0.7 creates a fully privileged session before required multi-factor authentication enrollment is completed. An attacker with the password for an MFA-required but unenrolled account can access protected functionality without providing a second factor.\n\n## Affected\n\n- `seppmail_secure_email_gateway_seg < 15.0.7`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":42.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}