CVE-2026-90441 — Fireware
HIGHCVE-2026-90441 is a high-severity (CVSS 8.1) Information Exposure vulnerability in watchguard fireware. A fix is available — see the affected versions and patch details below.
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…
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-90441.
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
firewarewatchguardDetection & mitigation playbook
Vendor / applianceDetect
Inventory every watchguard fireware deployment and check each version against the affected-products list above.
Fix
Apply the watchguard fireware security patch or hotfix for CVE-2026-90441 on the affected version, following the vendor advisory for your exact build.
Workarounds
Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
Frequently Asked Questions
Is CVE-2026-90441 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.