Fortinet: Improper limitation of a pathname to a restricted directory

Description

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

What to do

Install the fixed versions listed in the official advisory. If you cannot update right away, apply the workarounds or mitigations it describes and limit access to the affected service.

Details

Vendor

Fortinet

Affected versions

FortiMail 8.0: from 8.0.0 to 8.0.1 — fixed in 8.0.2
FortiMail 7.6: from 7.6.0 to 7.6.6 — fixed in 7.6.7
FortiMail 7.4: from 7.4.0 to 7.4.8 — fixed in 7.4.9
FortiMail 7.2: from 7.2.0 to 7.2.9 — fixed in 7.2.10 (in arrivo)
FortiMail 7.0: all versions (from the advisory and NVD; check the exact builds in the official advisory)

CVSS score

9.8

Actively exploited

Not known at this time

Source

Fortinet PSIRT – original advisory

Published

October 1, 2026

The description and the recommended action are quoted from the public advisory (the action is our generic advice); severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.