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CVE-2026-104286

CRITICAL 9.8 KNOWN EXPLOITED

Published 2026-10-01 · Last modified 2026-10-07

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.

ACTIVELY EXPLOITED

Confirmed exploited in the wild — in CISA KEV since 2026-10-01. Patch or mitigate now.

Exploitation likelihood

4.6%chance of exploitation in 30 days · 92nd percentile

● In CISA KEV (2026-10-01) ○ Catalogued PoC

Impact if exploited

9.8CVSS 3.1 · CRITICAL

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Fortinet

Products Fortimail

Weakness (CWE)

  • CWE-22: Execute unauthorized code or commands

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

References and research data (JSON)

Unverified PoC candidates

Catalogue matches for further research. These repositories have not been validated as working exploits.

4 candidates

Additional exploitation reports

Source-specific reports, separate from CISA KEV. Repeated observations from one source are not independent confirmations.

  • ENISA EU KEV · 2026-10-01EUVD · EUVD-2026-91042
  • VulnCheck KEV · 2026-10-01T00:00:00Z

    Source guidance: 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.

    Source ransomware assessment: Unknown

    VulnCheck KEV · CVE-2026-104286 · Updated 2026-10-01T00:00:00Z
  • VulnCheck KEV · 2026-10-01T00:00:00ZVulnCheck KEV · CVE-2026-104286
    VulnCheck KEV · CVE-2026-104286

Known Affected Software Configurations

VendorProductVersion range
FortinetFortimail≥ 7.2.0 and ≤ 7.4.8
FortinetFortimail≥ 7.6.0 and ≤ 7.6.6
FortinetFortimail≥ 8.0.0 and ≤ 8.0.1

All CVSS metrics

  • CRITICAL 9.8 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
  • CRITICAL 9.8 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS