Fortinet FortiMail up to 7.2.9/7.4.8/7.6.6/8.0.1 path traversal

Summaryinfo

A vulnerability, which was classified as very critical, was found in Fortinet FortiMail up to 7.2.9/7.4.8/7.6.6/8.0.1. This vulnerability affects unknown code. Such manipulation leads to path traversal. This vulnerability is listed as CVE-2026-104286. The attack may be performed from remote. In addition, an exploit is available.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Fortinet FortiMail up to 7.2.9/7.4.8/7.6.6/8.0.1. Affected by this issue is some unknown functionality. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at fortiguard.fortinet.com. This vulnerability is handled as CVE-2026-104286 since 10/01/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are unknown but an exploit is available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/03/2026). This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

It is declared as attacked. This issue was added on 10/01/2026 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 10/04/2026:

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 BO

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at EUVD (EUVD-2026-91042) and CERT Bund (WID-SEC-2026-3701). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

• Fortinet FortiMail

Productinfo

Vendor

• Fortinet

Name

• FortiMail

Version

• 7.2.0
• 7.2.1
• 7.2.2
• 7.2.3
• 7.2.4
• 7.2.5
• 7.2.6
• 7.2.7
• 7.2.8
• 7.2.9
• 7.4.0
• 7.4.1
• 7.4.2
• 7.4.3
• 7.4.4
• 7.4.5
• 7.4.6
• 7.4.7
• 7.4.8
• 7.6.0
• 7.6.1
• 7.6.2
• 7.6.3
• 7.6.4
• 7.6.5
• 7.6.6
• 8.0.0
• 8.0.1

License

• commercial

Website

• Vendor: https://www.fortinet.com/

CPE 2.3info

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CPE 2.2info

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Exploitinginfo

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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