CVE-2026-104286

CRITICAL CVSS 3.1: 9.8 EPSS 2.20% ACTIVE EXPLOIT
Updated Oct 07, 2026
Fortinet

CISA Known Exploited Vulnerability (KEV)

This vulnerability is actively exploited in the wild. Immediate patching is strongly recommended.

Due Date: Oct 04, 2026

Parameter Value
CVSS 9.8 (CRITICAL)
Affected Versions 7.2.0 — 8.0.1
Type CWE-22 (Path Traversal)
Vendor Fortinet
Public PoC Yes

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Weakness Type (CWE)

Vulnerable Products 3

Configuration From (including) Up to (excluding)
Fortinet Fortimail
cpe:2.3:a:fortinet:fortimail:*:*:*:*:*:*:*:*
7.2.0 <= 7.4.8
Fortinet Fortimail
cpe:2.3:a:fortinet:fortimail:*:*:*:*:*:*:*:*
7.6.0 <= 7.6.6
Fortinet Fortimail
cpe:2.3:a:fortinet:fortimail:*:*:*:*:*:*:*:*
8.0.0 <= 8.0.1