Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since October 1, 2026.
CVE-2026-104286
Fortinet FortiMail Path Traversal Vulnerability
Added to KEV October 1, 2026
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2026-104286
- CWE
- CWE-22CWE-158
- Affected products
- FortiMail · Fortinet FortiMail · Fortinet
What happened
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 it means for your business
Fortinet FortiMail is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-104286). 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. CISA remediation due date: 2026-10-04. If you need help checking exposure, call (864) 335-9223.
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.
CISA due date: October 4, 2026
Sources
Related briefs
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