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Vulnerability record · CVE-2026-104286 · published 1 October 2026

CVE-2026-104286: Fortinet fortimail path traversal vulnerability

Fortinet · Fortimail

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.

9.8 CVSS 3.1 Critical CISA KEV since 1 Oct 2026 EPSS 1.8% · top 22.5% CWE-22 · Path traversal
9.8CVSS 3.1 base score
1.8%EPSS exploitation probability, 30 days
YesIn CISA KEV, federal fix due in 0 days
1Affected product versions listed by NVD
2References
2 Oct 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation in the wild

CISA added CVE-2026-104286 to the Known Exploited Vulnerabilities catalog on 1 October 2026 as "Fortinet FortiMail Path Traversal Vulnerability". 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. Federal deadline 4 October 2026.

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://fortiguard.fortinet.com/psirt/FG-IR-26-175 MitigationVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-104286 US Government Resource

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-104286), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.