CVE-2026-104286 Exploited in the wild
Fortinet FortiMail Path Traversal Vulnerability
- Risk score
- 100/100
- CVSS
- 9.8 v3.1
- Exploit chance (30 days)
- 2.2%
- Published
- 1 Oct 2026
- Added to CISA's exploited list
- 1 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- Fortinet FortiMail has a path traversal vulnerability that allows an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests. This could lead to a complete compromise of the system.
- Affected
- {'products': ['FortiMail'], 'packages': [], 'versions': ['8.0.0 through 8.0.1', '7.6.0 through 7.6.6', '7.4.0 through 7.4.8', '7.2.0 through 7.2.9']}
- Fix
- Apply mitigations in accordance with vendor instructions
- Exploitation
- Exploited in the wild
Story map
At a glance
Fortinet Fortimail: Red, act today. Fortinet FortiMail has a path traversal vulnerability that allows an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests. This could lead to a complete compromise of the system.
The flaws
- CVE-2026-104286: Fortinet FortiMail Path Traversal Vulnerability (CVSS 9.8 · EPSS 2% · exploited)
The fix
Fix: Apply mitigations in accordance with vendor instructions
Who is exposed: {'products': ['FortiMail'], 'packages': [], 'versions': ['8.0.0 through 8.0.1', '7.6.0 through 7.6.6', '7.4.0 through 7.4.8', '7.2.0 through 7.2.9']}
Where it stands
- Exploited in the wild
- On CISA's exploited list since 1 Oct
- US federal deadline 4 Oct
How it unfolded
- 1 Oct, CISA (official): Added to the Known Exploited Vulnerabilities list
- 4 Oct, Deadline (official): US federal agencies must have patched
Connects to
- Same weakness: Path traversal (CWE-22). 399 other warnings in 30 days
Why it is Red
- CVSS 9.8 critical
- Exploited in the wild (CISA KEV)
- Remotely exploitable without logging in
- On your watchlist: fortinet
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 each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
References
Original description
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.
Last activity 1 Oct 2026. Patch Forecast updates every hour.