CVE-2026-90441
Received Received - Intake

wgagent Management Daemon Session Crash and File Read Vulnerability

Publication date: 2026-09-30

Last updated on: 2026-09-30

Assigner: WatchGuard Technologies, Inc.

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.

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Meta Information

Published
2026-09-30
Last Modified
2026-09-30
Generated
2026-09-30
AI Q&A
2026-09-30
EPSS Evaluated
N/A
NVD
CVE-2026-90441
EUVD
EUVD-2026-89494

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
watchguard fireware_os From 2026.3 (inc) to 2026.3.2 (inc)
watchguard fireware_os From 2025.0 (inc) to 2026.2.3 (inc)
watchguard fireware_os From 12.0 (inc) to 12.12.3 (inc)
watchguard fireware_os From 12.0 (inc) to 12.5.21 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

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Executive Summary

This vulnerability is a missing authorization issue in the wgagent management daemon's session initialization function. An authenticated low-privileged user, including read-only or guest admin accounts, can crash the wgagent process and read arbitrary files accessible to the daemon by sending a specially crafted management API request.

Detection Guidance

Detecting this vulnerability requires checking Fireware OS versions for affected releases (2026.3 to 2026.3.2, 2025.0 to 2026.2.3, 12.0 to 12.12.3, or 12.0 to 12.5.21). Monitor wgagent process logs for crashes or unusual API requests. Use network traffic analysis to detect suspicious management API interactions.

Impact Analysis

This vulnerability allows unauthorized users to crash the wgagent process and access sensitive files on the system. This could lead to data breaches, system instability, or unauthorized information disclosure depending on the files accessible to the daemon.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, potentially violating GDPR's data protection requirements and HIPAA's safeguards for protected health information. Organizations may face compliance violations, fines, or legal consequences if exploited.

Mitigation Strategies

Upgrade Fireware OS to patched versions (2026.3.2, 2026.2.3, 12.12.3, or 12.5.21) immediately. Restrict low-privileged user access to management APIs. Disable guest or read-only administrator accounts if not required. Monitor wgagent processes for crashes or unauthorized file access attempts.

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