CVE-2026-93865

Critical

Description

A missing authentication vulnerability in the Fireware OS FireCluster synchronization daemon allows a remote, unauthenticated attacker to invoke privileged system-level administrative actions by sending a specially crafted request to the FireCluster management IP when the clustering feature is enabled.

SeverityCritical

CVSS9.2

Exploit probability—

ProductFireware OS

PublishedOct 27, 2026

First seenOct 27, 2026

Weakness typeCWE-306Missing authentication for critical function CWE-77Command injection CWE-862Missing authorization

How to fix

Update

WatchGuard Fireware OS2026.4, 12.12.4, 12.5.22 or later

Vendor advisories

psirt.watchguard.com/CVE-2026-93865

Affected products

Product	Affected versions	Fixed in
WatchGuard Fireware OS	2025.1 ≤ v < 2026.4, 12.0 ≤ v < 12.12.4, 12.0 ≤ v < 12.5.22	2026.4, 12.12.4, 12.5.22

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