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Advisory severityCritical9.8Fortinet Exploited CISA KEV

Critical [CVE-2026-104286] Improper limitation of a pathname to a restricted directory

This critical-severity Fortinet advisory covers CVE-2026-104286 affecting FortiMail.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

FG-IR-26-175 Source published Source updated

VulniPulse record published Record updated

CVE-2026-104286
Affected products & platforms
FortinetFortiMail
Open source advisory

Android app · Google Play

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Summary

CVSSv3 Score:

9.8

An Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') [CWE-22] and Improper Neutralization of NULL Byte or NULL Character [CWE-158] vulnerability may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.

This has been reported to be exploited in the wild, customers are urged to apply the workaround below.

Revised on 2026-10-07 00:00:00

Affected product named by the advisory: FortiMail.

CISA Known Exploited Vulnerability

Listed:
Oct 1, 2026 · federal remediation due Oct 4, 2026
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.
Ransomware use:
Unknown

KEV is a prioritization signal from CISA — remediation detail still comes from the vendor advisory.

Affected versions
  • FortiMail: 7.0.0 through 8.0.0 (vendor-listed versions)

Official advisory · high-confidence parse· fetched 5 days ago·verify at source

Fixed versions

No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.

Official advisory · high-confidence parse· fetched 5 days ago·verify at source

Mitigation checklist

Temporary workarounds
  • This has been reported to be exploited in the wild, customers are urged to apply the workaround below.

Official advisory · high-confidence parse· fetched 5 days ago·verify at source

Discussion(0)

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