Is CVE-2026-59839 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-59839 being exploited in the wild.

How severe is CVE-2026-59839?

Medium severity, with a CVSS score of 5.5, published 14 July 2026.

Which products and versions are affected?

Fortinet FortiOS 7.6.0 through 7.6.6, 7.4.0 through 7.4.9, 7.2 all versions, 7.0 all versions, 6.4 all versions; Fortinet Fortipam 1.8.0, 1.7.0 through 1.7.2, 1.6 all versions, 1.5 all versions, 1.4 all versions, 1.3 all versions, 1.2 all versions, 1.1 all versions, 1.0 all versions; Fortinet FortiProxy 7.6.0 through 7.6.5, 7.4 through 7.4.13, 7.2 all versions, 7.0 all versions; Fortinet FortiSwitch-Manager All versions.

Is there a fix for CVE-2026-59839?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-59839 attacked?

It is attacked with physical access, in an operating system.

Am I affected by CVE-2026-59839?

Check whether you run Fortinet FortiOS, Fortinet Fortipam, Fortinet FortiProxy or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-59839: Fortinet FortiOS and FortiProxy path traversal in CLI

CVE-2026-59839 · Severity: medium · CVSS 5.5 · Published 2026-07-14

A security vulnerability exists in several Fortinet networking and security products, including FortiOS and FortiProxy, which are used to manage corporate networks and secure web traffic. A highly privileged user with physical access to the device could use specific commands to delete critical system files. This could lead to a complete failure of the device, causing significant network downtime and requiring manual restoration of the hardware.

Technologies: Fortinet FortiOS, Fortinet Fortipam, Fortinet FortiProxy. Vendors: Fortinet.

Quick answers

Is CVE-2026-59839 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-59839 being exploited in the wild.
How severe is CVE-2026-59839?: Medium severity, with a CVSS score of 5.5, published 14 July 2026.
Which products and versions are affected?: Fortinet FortiOS 7.6.0 through 7.6.6, 7.4.0 through 7.4.9, 7.2 all versions, 7.0 all versions, 6.4 all versions; Fortinet Fortipam 1.8.0, 1.7.0 through 1.7.2, 1.6 all versions, 1.5 all versions, 1.4 all versions, 1.3 all versions, 1.2 all versions, 1.1 all versions, 1.0 all versions; Fortinet FortiProxy 7.6.0 through 7.6.5, 7.4 through 7.4.13, 7.2 all versions, 7.0 all versions; Fortinet FortiSwitch-Manager All versions.
Is there a fix for CVE-2026-59839?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-59839 attacked?: It is attacked with physical access, in an operating system.
Am I affected by CVE-2026-59839?: Check whether you run Fortinet FortiOS, Fortinet Fortipam, Fortinet FortiProxy or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A path traversal vulnerability (CWE-22) exists in the Command Line Interface (CLI) of multiple Fortinet products. The flaw is rooted in improper limitation of pathnames to restricted directories within specific CLI commands. An attacker must have physical access to the device and possess high-level administrative privileges (PR:H) to exploit this. Successful exploitation allows the attacker to traverse the file system and delete critical files, including the root file system, leading to a denial-of-service condition or unauthorized command execution. Patches are available for several versions, including FortiOS 7.4.10 and FortiProxy 7.6.6.

Affected products

Fortinet FortiOS 7.6.0 through 7.6.6, 7.4.0 through 7.4.9, 7.2 all versions, 7.0 all versions, 6.4 all versions
Fortinet FortiPAM 1.8.0, 1.7.0 through 1.7.2, 1.6 all versions, 1.5 all versions, 1.4 all versions, 1.3 all versions, 1.2 all versions, 1.1 all versions, 1.0 all versions
Fortinet FortiProxy 7.6.0 through 7.6.5, 7.4 through 7.4.13, 7.2 all versions, 7.0 all versions
Fortinet FortiSwitch Manager All versions

Timeline

2026-07-14: disclosed: Initial publication by Fortinet PSIRT
2026-07-14: advisory: NVD entry created

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-151

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.