CISA adds Fortinet FortiMail path traversal CVE-2026-104286 to KEV catalog on evidence of active exploitation

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1. cisa.gov ↗ · pub. 01/10/2026 09:00 · coletado 19/10 18:37 primeiro registro

   CISA adds Fortinet FortiMail path traversal CVE-2026-104286 to KEV catalog on evidence of active exploitation

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   CISA added one vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog on 2026-10-01, citing evidence of active exploitation: CVE-2026-104286, a path traversal flaw in Fortinet FortiMail. CISA describes this vulnerability type as a frequent attack vector for malicious cyber actors and a significant risk to the federal enterprise. The alert gives no technical details, exploitation specifics, affected versions or attribution.

   The alert also references BOD 26-04, which requires FCEB agencies to prioritize rapid remediation of KEV-listed CVEs on publicly exposed assets that grant total control after exploitation. It further sets expectations for checking whether threat actors compromised a system before the patch was applied. CISA encourages all organizations to adopt risk-based vulnerability management and prioritize KEV remediation.

   Technical Details

   • CVE-2026-104286: Fortinet FortiMail, path traversal vulnerability.
   • The article does not name affected versions, exploitation methods, IOCs or threat actors.

   Remediation

   • Prioritize remediation of CVE-2026-104286 on Fortinet FortiMail assets, especially those that are publicly exposed.
   • Consult the Fortinet vendor advisory for affected versions and patches; the CISA alert does not list them.
   • Per BOD 26-04, check whether systems were compromised before the patch was applied.