What’s Vulnerable › Vulnerabilities
CVE-2026-86136: Fireware OS Missing Authorization in wgagent Management API Allows Denial of Service - Variant A
- Severity: high (CVSS 8.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-30 · updated 2026-10-06
- Weakness: CWE-22
Description
A missing authorization vulnerability in the wgagent management daemon's session initialization function allows an authenticated, low-privileged user (including a read-only or guest administrator account) to crash the wgagent process and read arbitrary files accessible to the daemon by submitting a specially crafted management API request.
Affected products
- WatchGuard Fireware OS: from 12.0 before 12.5.21; from 12.12 before 12.12.3; from 2025.0 before 2026.2.3; from 2026.3 before 2026.3.2 — fixed in 12.12.3, 12.5.21, 2026.2.3, 2026.3.2
How to fix
Upgrade to a fixed version: WatchGuard Fireware OS 12.12.3, 12.5.21, 2026.2.3, 2026.3.2. Check the vendor advisory for mitigations.
References
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