CVE-2026-104286

CRITICALCVSS 3.1 · 9.8 · psirt@fortinet.com

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

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.

CISA KEV: known exploited

Added: 2026-10-01 · Due: 2026-10-04

Known ransomware use: Unknown

EPSS: 4.57% · Percentile: 91.6%

As of 2026-10-27

EPSS estimates exploitation probability over the next 30 days. KEV due dates apply to US federal civilian agencies. Confirm your affected versions in vendor advisories.

CWE: CWE-22 · Published: 2026-10-01T20:17:24.010 · Modified: 2026-10-07T18:17:15.240

Sources: NIST NVD, CISA KEV, FIRST EPSS. NVD and EPSS cached up to 6 hours; KEV up to 12 hours.

References and fixes

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