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CVE-2026-104286

Fortinet FortiMail Path Traversal

9.8 CRITICALActively exploited (CISA KEV)EPSS 2.20%
  1. Published1 Oct 2026
  2. Added to CISA KEV1 Oct 2026
  3. Remediation due4 Oct 2026
Actively exploited (CISA KEV)

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.

Added to KEV: 1 Oct 2026Federal remediation due: 4 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 may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Fortinet Fortimail≥ 7.2.0 ≤ 7.4.8 · ≥ 7.6.0 ≤ 7.6.6 · ≥ 8.0.0 ≤ 8.0.1

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2026-104286 being actively exploited?

Yes. CVE-2026-104286 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 1 Oct 2026.

How severe is CVE-2026-104286?

CVE-2026-104286 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 2.20% probability of exploitation.

Which products are affected by CVE-2026-104286?

Affected products include Fortinet Fortimail.

How do I fix CVE-2026-104286?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-104286 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.