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CVE-2026-104286

Fortinet FortiMail Path Traversal Vulnerability

  • Critical 9.8
  • Exploited: added to CISA KEV 1 Oct 2026

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, FortiMail 7.0 all versions may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.

Key facts

Published
1 Oct 2026
Last changed
28 Oct 2026
Assigned by
fortinet
KEV added
1 Oct 2026
KEV fix due
4 Oct 2026
EPSS
4.573% likely to be exploited in the next 30 days, higher than 91.765% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.8CVSS 3.1, Criticalfrom the CNA (fortinet)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

What to do

  • Upgrade to FortiMail version 8.0.2 or above Upgrade to FortiMail version 7.6.7 or above Upgrade to FortiMail version 7.4.9 or above Upgrade to upcoming FortiMail version 7.2.10 or aboveCNA solution statement
  • 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 KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
FortinetFortiMail
  • Default status: unaffected
  • 8.0.0 up to and including 8.0.1 (affected)
  • 7.6.0 up to and including 7.6.6 (affected)
  • 7.4.0 up to and including 7.4.8 (affected)
  • 7.2.0 up to and including 7.2.9 (affected)
  • 7.0.0 up to and including 7.0.9 (affected)

Timeline

  1. 1 Oct 2026 Added to the CISA KEV catalogue
  2. 1 Oct 2026 Published

Weakness

Practice this bug class

HackZoneLabs has a hands-on lab on Path traversal (CWE-22).

Open the learning platform

References