CVE-2026-86136

What it is

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.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. High risk of service disruption.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-09-30 00:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-06 20:22 UTC Last updatedMost recent change to the record

Details

Published

2026-09-30 00:16 UTC

Last modified

2026-10-06 20:22 UTC

Exploit probability

0.3% · EPSS, next 30 days

Weakness

CWE-22 · Path traversal

Record status

Analyzed

Affected

• Watchguard Fireware < 12.5.21
• Watchguard Fireware < 12.12.3
• Watchguard Fireware < 2026.2.3
• Watchguard Fireware < 2026.3.2

Attack profile CVSS 4.0 · 7.1

Attack vector

Network

Complexity

Low

Attack requirements

None

Privileges needed

Low

User interaction

None

Confidentiality

Low

Integrity

None

Availability

High