CVE-2026-13375Network attack vector

Privileged stored XSS via Autotask configuration

Published Jul 2, 2026 · Updated Jul 2, 2026

Stored XSS in WatchGuard Fireware OS allows remote authenticated users to execute scripts in an administrator's browser. WatchGuard has not disclosed which Autotask configuration field accepts the payload or where Fireware renders it without output encoding. High-privilege access and a user viewing stored content are required; affected releases are 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 WatchGuard Fireware OS allows remote authenticated users to execute scripts in an administrator's browser. WatchGuard has not disclosed which Autotask configuration field accepts the payload or where Fireware renders it without output encoding. High-privilege access and a user viewing stored content are required; affected releases are 12.4 through 12.12, 12.5 through 12.5.18, and 2025.1 through 2026.2.

The record

CVE
CVE-2026-13375
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 TechnologiesCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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

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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