# CVE-2026-59837: Fortinet FortiOS and FortiPAM stack overflow in GUI

Source: https://junglewise.ai/threats/cve-2026-59837-fortinet-fortios-and-fortipam-stack-overflow-in-gui  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-14. Updated: 2026-07-14  
License: CC BY 4.0 with a link back

CVE-2026-59837 · Severity: medium · CVSS 6.6 · Published 2026-07-14

A security vulnerability exists in several Fortinet products, including the FortiOS operating system and FortiPAM access management tool. A highly privileged user could potentially take full control of the device or execute unauthorized commands by sending specially crafted web requests. While the risk is mitigated by the requirement for administrative access and the need to bypass modern security protections, an exploit could lead to a total compromise of the affected security appliance.

Technologies: [Fortinet FortiOS](https://junglewise.ai/threats/technologies/fortios), [Fortinet Fortipam](https://junglewise.ai/threats/technologies/fortipam), [Fortinet FortiProxy](https://junglewise.ai/threats/technologies/fortiproxy). Vendors: [Fortinet](https://junglewise.ai/threats/vendors/fortinet).

## Quick answers

**Is CVE-2026-59837 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-59837 being exploited in the wild.

**How severe is CVE-2026-59837?** Medium severity, with a CVSS score of 6.6, published 14 July 2026.

**Which products and versions are affected?** Fortinet FortiOS 7.4.0 through 7.4.1, 7.2 all versions; Fortinet Fortipam 1.0 through 1.8.2; Fortinet FortiProxy 7.4.0 through 7.4.13, 7.2 all versions.

**Is there a fix for CVE-2026-59837?** 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-2026-59837 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-59837?** Check whether you run Fortinet FortiOS, Fortinet Fortipam or Fortinet FortiProxy 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 stack-based buffer overflow vulnerability (CWE-121) exists in the GUI component of Fortinet FortiOS, FortiPAM, and FortiProxy. The flaw is triggered via specially crafted HTTP requests. Exploitation requires high privileges (PR:H) and is considered high complexity (AC:H) because an attacker must successfully bypass modern exploit mitigations, specifically stack protection (canaries) and Address Space Layout Randomization (ASLR). If successful, the attacker can achieve arbitrary code execution or command injection. Patches are available in FortiOS 7.4.2, FortiPAM 1.8.3, and FortiProxy 7.4.14; users on 7.2 branches are advised to migrate to fixed releases.

## Affected products

- Fortinet FortiOS 7.4.0 through 7.4.1, 7.2 all versions
- Fortinet FortiPAM 1.0 through 1.8.2
- Fortinet FortiProxy 7.4.0 through 7.4.13, 7.2 all versions

## Timeline

- 2026-07-14: advisory: Initial publication by Fortinet
- 2026-07-14: disclosed

## References

- [https://fortiguard.fortinet.com/psirt/FG-IR-26-148](https://fortiguard.fortinet.com/psirt/FG-IR-26-148)

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