# CVE-2026-90441: WatchGuard Fireware OS missing authorization in wgagent management API

Source: https://junglewise.ai/threats/cve-2026-90441-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-2026-90441 · Severity: info · Published 2026-09-30

WatchGuard Fireware OS, which powers the company's network security appliances, contains a missing authorization flaw in its wgagent management daemon. An authenticated user with minimal privileges—such as a read-only or guest admin account—can exploit this vulnerability by sending a crafted API request to crash the security service or read sensitive files. This could disrupt firewall operations or expose confidential data stored on the device.

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

## Quick answers

**Is CVE-2026-90441 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-90441 being exploited in the wild.

**How severe is CVE-2026-90441?** Informational severity, published 30 September 2026.

**Which products and versions are affected?** Watchguard Fireware OS Default: 2026.3 before 2026.3.2, 2025.0 before 2026.2.3, 12.0 before 12.12.3; T15/T35: 12.0 before 12.5.21.

**Is there a fix for CVE-2026-90441?** A patch was published on 2026-09-29: Fireware OS 2026.3.2, 2026.2.3, 12.12.3, 12.5.21 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-90441 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-90441?** 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

A missing authorization vulnerability (CWE-862) in the wgagent session initialization function fails to properly enforce access controls on management API endpoints. An authenticated, low-privileged user can submit a specially crafted request to trigger denial of service (resource exhaustion/uncontrolled consumption) or arbitrary file read. The vulnerability requires valid authentication credentials but does not require elevated privileges, making it accessible to read-only or guest administrator accounts.

## Affected products

- WatchGuard Fireware OS Default: 2026.3 before 2026.3.2, 2025.0 before 2026.2.3, 12.0 before 12.12.3; T15/T35: 12.0 before 12.5.21

## Timeline

- 2026-09-29: disclosed
- 2026-09-29: patched: Fireware OS 2026.3.2, 2026.2.3, 12.12.3, 12.5.21

## References

- [https://psirt.watchguard.com/CVE-2026-90441](https://psirt.watchguard.com/CVE-2026-90441)

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