CVE-2026-104286: Fortinet FortiMail Path

Last refreshed2026-10-03

Status: KEV | Advisory ID: CVE-2026-104286

Key Details

CVE	CVE-2026-104286
Affected products	Fortinet FortiMail
Exploitation status	Listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating confirmed active exploitation.
Classified as	CWE-22 (Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'))
KEV listing	Added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-10-01.
Federal remediation deadline	2026-10-04 (CISA KEV, Binding Operational Directive).

Affected Products, Subsystems & Sectors

Vendor	Product	Affected Versions	Patch Status
Fortinet	FortiMail

Vendor

Product

Affected Versions

Patch Status

Fortinet

FortiMail

Subsystems	General OT
Sectors	Multiple

What to Know

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.

What to Do

Monitor Fortinet's web page for any future patch releases.

References

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-104286
CVE	https://www.cve.org/CVERecord?id=CVE-2026-104286

Source

Reference

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-104286

CVE

https://www.cve.org/CVERecord?id=CVE-2026-104286

KEV Required Action

Field	Value
KEV Link	https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Date Added to KEV	2026-10-01
Required Action Due Date	2026-10-04
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.

Field

Value

KEV Link

https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Date Added to KEV

2026-10-01

Required Action Due Date

2026-10-04

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.