CVE-2026-104286

Published Oct 1, 2026

Last updated 3 hours ago

Overview

AI description

Automated description summarized from trusted sources.

CVE-2026-104286 is a path traversal and NULL byte neutralization vulnerability affecting the web management interface of Fortinet FortiMail. The flaw allows an unauthenticated attacker to send crafted HTTP or HTTPS requests to write arbitrary files outside of intended directories on the underlying system. By placing files onto the system, attackers can potentially execute unauthorized commands or code, which could lead to full control over the mail gateway. The vulnerability affects FortiMail versions 7.2.0 through 7.2.9, 7.4.0 through 7.4.8, 7.6.0 through 7.6.6, and 8.0.0 through 8.0.1. It has been added to the Cybersecurity and Infrastructure Security Agency's (CISA) Known Exploited Vulnerabilities (KEV) catalog following reports of active exploitation in the wild. To mitigate the issue, Fortinet recommends disabling Identity-Based Encryption (IBE) support or restricting access to the FortiMail management interface from the internet until official patches are released.

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.
Source: psirt@fortinet.com
NVD status: Analyzed
Products: fortimail

Risk scores

CVSS 3.1

Type: Secondary
Base score: 9.8
Impact score: 5.9
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: CRITICAL

Known exploits

Data from CISA

Vulnerability name: Fortinet FortiMail Path Traversal Vulnerability
Exploit added on: Oct 1, 2026
Exploit action due: Oct 4, 2026
Required action: 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.

Weaknesses

psirt@fortinet.com: CWE-22

Hype score is a measure of social media activity compared against trending CVEs from the past 12 months. Max score 100.

Hype score: 4

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:fortinet:fortimail:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "77C9CE10-1038-4100-81E0-234822E6373B",
            "versionEndIncluding": "7.4.8",
            "versionStartIncluding": "7.2.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:fortinet:fortimail:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "1EA73418-A7A1-4247-BA3E-969550962E0E",
            "versionEndIncluding": "7.6.6",
            "versionStartIncluding": "7.6.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:fortinet:fortimail:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "DDAF1B20-36CA-4DD4-9483-6B605001B9DA",
            "versionEndIncluding": "8.0.1",
            "versionStartIncluding": "8.0.0",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.