CVE-2026-86136

HIGH CVSS 4.0: 7.1 EPSS 0.30%
Updated Oct 06, 2026
Watchguard
Parameter Value
CVSS 7.1 (HIGH)
Affected Versions 12.0 — 2026.3.2
Fixed In 12.5.21
Type CWE-862 (Missing Authorization), CWE-476 (NULL Pointer Dereference), CWE-22 (Path Traversal)
Vendor Watchguard
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
Low
Partial data leak
Integrity
None
No data modification
Availability
High
Complete denial of service

CVSS Vector v4.0

Vulnerable Products 8

Configuration From (including) Up to (excluding)
Watchguard Fireware_Os
cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*
12.0 12.5.21
Watchguard Fireware_Os
cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*
2026.0 2026.3.2
Watchguard Fireware_Os
cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*
2025.0 2026.2.3
Watchguard Fireware_Os
cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*
12.0 12.12.3
Watchguard Fireware
cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*
12.0 12.5.21
Watchguard Fireware
cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*
12.12 12.12.3
Watchguard Fireware
cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*
2025.0 2026.2.3
Watchguard Fireware
cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*
2026.3 2026.3.2