Cross-Site Scripting Vulnerability in WatchGuard Fireware OS
CVE-2026-13374

4.8MEDIUM

Key Information:

Vendor

Watchguard

Status
Fireware Os
Vendor
CVE Published:
2 July 2026

What is CVE-2026-13374?

An improper neutralization of input during the web page generation in WatchGuard Fireware OS's ConnectWise Technology Integration module enables Stored Cross-Site Scripting (XSS). This vulnerability offers an additional unmitigated attack vector that can compromise the security of affected installations, allowing attackers to inject malicious scripts that can execute in the context of user sessions.

Affected Version(s)

Fireware OS 12.4 <= 12.12

Fireware OS 12.5 <= 12.5.18

Fireware OS 2025.1 <= 2026.2

References

https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-...
vendor-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Simone Paganessi (https://www.linkedin.com/in/simonepaganessi)
.