CVE-2026-86136
Received Received - Intake

Missing Authorization in WGagent Management Daemon Allows File Read

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-2026-86136
EUVD
EUVD-2026-89491

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
watchguard fireware_os From 2026.0 (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-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.

Attack-Flow Graph

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Executive Summary

This is a missing authorization vulnerability in the wgagent management daemon's session initialization function in Fireware OS. 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 against affected ranges (2026.0-2026.3.2, 2025.0-2026.2.3, 12.0-12.12.3, 12.0-12.5.21). Use system commands like 'show version' or 'system info' to verify OS version. Monitor wgagent process crashes or unusual file access patterns via logs.

Impact Analysis

An attacker could exploit this to crash the wgagent process, disrupting management services, and access sensitive files on the system that the daemon can read. This may lead to unauthorized data exposure or service disruption.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, potentially violating GDPR's data protection principles or HIPAA's security requirements for protected health information. Compliance may be impacted if exploited.

Mitigation Strategies

Immediately upgrade Fireware OS to patched versions (2026.3.2, 2026.2.3, 12.12.3, or 12.5.21). Restrict low-privileged user access to management APIs. Disable guest or read-only admin accounts if not required. Monitor wgagent logs for suspicious API requests.

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