8.7
HighCVSS 4.0 · from WatchGuard
CVE-2026-90465
Fireware OS Missing Authentication in FireCluster Sync Allows Privilege Escalation
Fireware OS · CWE-290 · CWE-290AffectedFireware OS, Fireware OS
FixUpdate to 2026.4, 12.12.4, 12.5.22 or newer
PublishedOct 27, 15:52 · WatchGuard
ScoredOct 27 · 8.7 · WatchGuard
Exploit code publicNone known · checked 21:18 UTC
ExploitedNone known · CISA KEV checked 22:07 UTC
What we know
No known exploitation. CISA KEV, checked 22:07 UTC.
No public exploit code known. Exploit-DB, Metasploit, Nuclei, checked 21:18 UTC.
An attacker has to be on the same network. CVSS: adjacent network.
A successful attack can read and change data and take the service down. CVSS: high impact on confidentiality, integrity and availability.
A successful attack gives full control of the affected system. CISA: technical impact total.
Description
A missing authentication vulnerability in the FireCluster Sync processing allows an attacker positioned on the cluster interconnect, such as a compromised cluster peer or an on-path network attacker, to invoke privileged firewall management actions as root by sending a specially crafted request.
From WatchGuard
Affected and fixed versions
ProductAffectedFixed inFireware OS2025.1 – before 2026.42026.4Fireware OS12.0 – before 12.12.412.12.4Fireware OS12.0 – before 12.5.2212.5.22
Exploit code
Exploit-DBnone knownMetasploitnone knownNucleinone known