# CVE-2026-86136: WatchGuard Fireware OS missing authorization in wgagent management API

Source: https://junglewise.ai/threats/cve-2026-86136-a-missing-authorization-vulnerability-in-the-wgagent-management  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-30. Updated: 2026-09-30  
License: CC BY 4.0 with a link back

CVE-2026-86136 · Severity: info · Published 2026-09-30

WatchGuard Fireware OS, which runs on network security appliances, contains a flaw in its management daemon that allows low-privileged users (including read-only administrators) to crash the daemon and read sensitive files. An authenticated attacker with minimal permissions can exploit this by sending a crafted API request, potentially exposing confidential data or disrupting firewall operations.

Technologies: [Watchguard Fireware OS](https://junglewise.ai/threats/technologies/fireware-os). Vendors: [Watchguard](https://junglewise.ai/threats/vendors/watchguard).

## Quick answers

**Is CVE-2026-86136 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-86136 being exploited in the wild.

**How severe is CVE-2026-86136?** Informational severity, published 30 September 2026.

**Which products and versions are affected?** Watchguard Fireware OS 2026.0 to <2026.3.2, 2025.0 to <2026.2.3, 12.0 to <12.12.3 (Default); 12.0 to <12.5.21 (T15/T35).

**Is there a fix for CVE-2026-86136?** 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-2026-86136 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-86136?** Check whether you run Watchguard Fireware OS 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

The wgagent management daemon fails to properly authorize requests in its session initialization function, allowing authenticated low-privileged users to bypass access controls. The vulnerability combines path traversal (CWE-22), NULL pointer dereference (CWE-476), and missing authorization (CWE-862) flaws that can be triggered via the management API with a specially crafted request, enabling arbitrary file read and process crash.

## Affected products

- WatchGuard Fireware OS 2026.0 to <2026.3.2, 2025.0 to <2026.2.3, 12.0 to <12.12.3 (Default); 12.0 to <12.5.21 (T15/T35)

## Timeline

- 2026-09-29: disclosed
- 2026-09-30: advisory

## References

- [https://psirt.watchguard.com/CVE-2026-86136](https://psirt.watchguard.com/CVE-2026-86136)

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