Actively exploited in the wild
Fortinet FortiMail Path Traversal Vulnerability
Fortinet - FortiMail · Listed in the CISA KEV since 2026-10-01. This indicates confirmed attacks in production environments.
Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CVE-2026-104286
CriticalCVSS 9.8KEVSummary
A path traversal vulnerability in Fortinet FortiMail (versions 8.0.0-8.0.1, 7.6.0-7.6.6, 7.4.0-7.4.8, 7.2.0-7.2.9) stems from improper limitation of a pathname to a restricted directory. An unauthenticated attacker can write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.
Risk Assessment
An unauthenticated attacker can write arbitrary files on the server, potentially leading to system compromise or further escalation. FortiMail is a critical mail infrastructure component, so compromise can have severe consequences.
Recommendation
Update FortiMail to a version containing the fix (outside the listed ranges) as soon as possible and restrict access to the management interface from untrusted networks.
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Original NVD description (English source)
An improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1, FortiMail 7.6.0 through 7.6.6, FortiMail 7.4.0 through 7.4.8, FortiMail 7.2.0 through 7.2.9 may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

