Fortinet FortiMail Path Traversal Vulnerability
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 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
Read at CISA Known Exploited Vulnerabilities catalog
- Vendor
- Fortinet
- Product
- FortiMail
- EPSS
- 0.022 (p82)
- CISA KEV
- added 1 Oct 2026, due 4 Oct 2026 (28d overdue)
- Exploitation
- observed in the wild
- Fix
- available
- Weakness
- CWE-22, CWE-158
- Exposure class
Why it ranks 75 (Critical)
- CISA KEV listed, remediation due 2026-10-04
- Exposed product class: email
- Widely deployed vendor product (Fortinet)
- Covered by 4 independent sources
- Fix available
- Recency: items published within 24 hours gain 15, within 72 hours 6, within 7 days 2.
Links
- CISA Known Exploited Vulnerabilities catalog (nvd.nist.gov)
- Vendor advisory (fortiguard.fortinet.com)
- CVE-2026-104286 on this site · NVD · CVE.org · Vulnpedia · KEV
Related coverage
Other items that share a CVE or were clustered with this one.