CVE-2026-13374Network attack vector

Stored XSS via unneutralized ConnectWise configuration

Published Jul 2, 2026 · Updated Jul 2, 2026

Stored XSS in the ConnectWise integration in Fireware OS allows remote authenticated users to execute scripts in another user's browser. The configuration path stores user-controlled integration data and later renders it in Fireware Web UI without adequate neutralization; WatchGuard has not disclosed the exact field or rendering function. Device Administrator privileges and a separate viewer are required, and affected releases span 12.4 through 12.12, 12.5 through 12.5.18, and 2025.1 through 2026.2.

CVSS severity4.8
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the ConnectWise integration in Fireware OS allows remote authenticated users to execute scripts in another user's browser. The configuration path stores user-controlled integration data and later renders it in Fireware Web UI without adequate neutralization; WatchGuard has not disclosed the exact field or rendering function. Device Administrator privileges and a separate viewer are required, and affected releases span 12.4 through 12.12, 12.5 through 12.5.18, and 2025.1 through 2026.2.

The record

CVE
CVE-2026-13374
Published
Jul 2, 2026
Updated
Jul 2, 2026
Vendor
WatchGuard Technologies
Product
Fireware OS
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=12.4 <=12.12
  2. Affected versionversion=12.5 <=12.5.18
  3. Affected versionversion=2025.1 <=2026.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

WatchGuard Technologies · Fireware OSversion=12.4 <=12.12; version=12.5 <=12.5.18; version=2025.1 <=2026.2

Published CVSS scores

4.8WatchGuard Technologies, Inc.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
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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