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CVE-2026-104286

An improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1,…

Critical9.8Known exploitedPublic exploitEPSS 4.6%
Published
Updated
Reserved
Assigned by
fortinet

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.

Exploited in the wild

CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Fortinet FortiMail Path Traversal Vulnerability.

Added
1 Oct 2026
Fix due (US federal)
4 Oct 2026
Used by ransomware
Not known

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.

Public exploit

An exploit or proof of concept is public: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: it is being exploited.

Timeline

  1. ID reserved

    By fortinet

  2. Published

  3. Added to CISA KEV

    Known exploited in the wild

  4. · 27 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-104286, by who scored it
Scored byCVSSScoreVector
fortinetCNA (assigner)3.1Critical9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
NVDNVD · Analyzed3.1Critical9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
4.6% · top 8.3% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: active · Automatable: yes · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.

Weakness

Affected products

  • Fortinet · FortiMail

    • affected 8.0.0 – ≤ 8.0.1
    • affected 7.6.0 – ≤ 7.6.6
    • affected 7.4.0 – ≤ 7.4.8
    • affected 7.2.0 – ≤ 7.2.9
    • affected 7.0.0 – ≤ 7.0.9

What to do

Solution: 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 above

References (2)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .