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 9.8KEVExploitation Probability (EPSS)
Very high risk92th percentile - higher than 92% of all known CVEs
Summary
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, and all 7.0 versions) allows an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.
Risk Assessment
An attacker could remotely write malicious files to the mail server, potentially leading to code execution or system compromise without authentication.
Recommendation
Update FortiMail to a patched version as soon as possible and consider restricting access to the administrative interface.
Other vulnerabilities in FortiMail
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, FortiMail 7.0 all versions 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