Vulnerability Report

CVE-2026-13374

Title: Stored XSS in WatchGuard Fireware OS (ConnectWise Integration)

XSS

Proof Of Concept

No public PoC currently indexed for CVE-2026-13374.

CWE Category CWE-79

Published Date Jul 03, 2026

Modified Date Jul 09, 2026

Exploit Status Not Found

Score 4.8 CVSS v4.0

Exploit Probability (EPSS)

0.16%

Vulnerability Summary

CVE-2026-13374: Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WatchGuard Fireware OS (ConnectWise Technology Integration module) allows Stored XSS. This vulnerability is an additional unmitigated attack path for CVE-2025-13937. This issue affects Fireware OS 12.4 up to and including 12.12, 12.5 up to and including 12.5.18, and 2025.1 up to and including 2026.2.

Impacted Vendors

watchguard 38

Reference Links

https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00015

CVSS v4.0

Source Entity 5d1c2695-1a31-4499-88ae-e847036fd7e3

Severity MEDIUM

4.8

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

PASSIVE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

N/A

RAW VECTOR

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

4.8

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

REQUIRED

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

CHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns