This weekWhy this label: added to the catalog 25 days ago

CVE-2026-104286Fortinet FortiMail Path Traversal Vulnerability

Product: Fortinet FortiMail
Added to CISA KEV: October 1, 2026
Deadline for US federal agencies: October 4, 2026
Known ransomware use: Not known
EPSS, next 30 days: 4.6%, higher than 91% of scored CVEs (Oct 25, 2026)
Weakness: CWE-22, CWE-158

What CISA says

Fortinet FortiMail contains a path traversal and an improper neutralization of NULL byte or NULL character vulnerability that may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.

What CISA asks you to do

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.

Sources

Also exploited recently

Data from CISA's Known Exploited Vulnerabilities catalog (public domain) and FIRST EPSS, refreshed hourly. Rheono did not find or test this vulnerability; this page summarizes public sources.