Fortinet FortiOS/FortiPAM/FortiProxy Pathname path traversal

Summaryinfo

A vulnerability was found in Fortinet FortiOS, FortiPAM and FortiProxy. It has been rated as very critical. Affected by this issue is some unknown functionality of the component Pathname. Performing a manipulation results in path traversal. This vulnerability is reported as CVE-2026-59839. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Fortinet FortiOS, FortiPAM and FortiProxy (version unknown). It has been classified as very critical. This affects an unknown function of the component Pathname. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Fortinet FortiOS 7.6.0 through 7.6.6, FortiOS 7.4.0 through 7.4.9, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions, FortiPAM 1.8.0, FortiPAM 1.7.0 through 1.7.2, FortiPAM 1.6 all versions, FortiPAM 1.5 all versions, FortiPAM 1.4 all versions, FortiPAM 1.3 all versions, FortiPAM 1.2 all versions, FortiPAM 1.1 all versions, FortiPAM 1.0 all versions, FortiProxy 7.6.0 through 7.6.5, FortiProxy 7.4 through 7.4.13, FortiProxy 7.2 all versions, FortiProxy 7.0 all versions may allow attacker to execute unauthorized code or commands via <insert attack vector here>

The advisory is shared at fortiguard.fortinet.com. This vulnerability is uniquely identified as CVE-2026-59839 since 07/07/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/14/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue.

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

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Productinfo

Type

• Firewall Software

Vendor

• Fortinet

Name

• FortiOS
• FortiPAM
• FortiProxy

License

• commercial

Website

• Vendor: https://www.fortinet.com/

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