Missing Authentication Vulnerability in FireCluster Sync by WatchGuard
CVE-2026-90465

8.7HIGH

Key Information:

Vendor

Watchguard

Status
Fireware Os
Vendor
CVE Published:
27 October 2026

Badges

👾 Exploit Exists

What is CVE-2026-90465?

A missing authentication vulnerability in the FireCluster Sync processing could allow an attacker, positioned on the cluster interconnect, to exploit this weakness. This could be a result of a compromised cluster peer or an on-path network attacker. By sending a specially crafted request, the attacker may invoke privileged firewall management actions, executing commands with root privileges and potentially compromising the security of the network.

Affected Version(s)

Fireware OS Default 2025.1 < 2026.4

Fireware OS Default 12.0 < 12.12.4

Fireware OS T15/T35 12.0 < 12.5.22

References

https://psirt.watchguard.com/CVE-2026-90465
vendor-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

WatchGuard AI Security Research
.