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WatchGuard Fireware OS EUVDEUVD-2026-41449

| CVE-2026-13374 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-07-02 WatchGuard GHSA-vjhv-mh94-cxp5
XSS Watchguard Fireware Os
4.8
CVSS 4.0 · Vendor: WatchGuard
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Severity by source

Vendor (WatchGuard) PRIMARY
4.8 MEDIUM
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
vuln.today AI
4.8 MEDIUM

PR:H reflects admin-level access needed to plant payload; scope change (S:C) captures session impact on victim browsers with low C/I; no availability impact.

3.1 AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (WatchGuard).

CVSS VectorVendor: WatchGuard

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
P
Scope
X

Lifecycle Timeline

1
Analysis Generated
Jul 02, 2026 - 23:57 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Stored cross-site scripting in WatchGuard Fireware OS via the ConnectWise Technology Integration module allows a highly privileged attacker to inject persistent malicious scripts into the web management interface, which then execute in the browsers of other authenticated users who view the affected pages. This vulnerability is explicitly described as an additional, previously unmitigated attack path for CVE-2025-13937, indicating that the prior remediation was incomplete and a bypass exists. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain high-privileged Fireware OS admin credentials
Delivery
Access ConnectWise Integration module in web UI
Exploit
Inject stored XSS payload into unsanitized input field
Execution
Victim admin authenticates and views affected management page
Persist
Malicious script executes in victim's browser
Impact
Steal session token or perform admin actions as victim
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Vulnerability AssessmentAI

Exploitation Exploitation requires three specific conditions to align: (1) The ConnectWise Technology Integration module must be configured and active within Fireware OS - this is a non-default, MSP-oriented integration, so standard deployments without ConnectWise are not affected. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 4.8 (Medium) reflects the high privilege barrier (PR:H) required to plant the payload and the passive user interaction (UI:P) needed to trigger it. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A threat actor who has obtained high-privileged administrative credentials to a WatchGuard Fireware OS management interface - through phishing, credential stuffing, or a prior compromise - navigates to the ConnectWise Technology Integration configuration panel and injects a malicious JavaScript payload into an input field that is stored and later rendered without sanitization. When another administrator or privileged user subsequently logs in and views the affected management page, the script executes in their browser, potentially stealing session tokens, redirecting authentication, or performing administrative actions on behalf of the victim.
Remediation Consult WatchGuard PSIRT advisory WGSA-2026-00015 at https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00015 for the specific patched versions; the input data does not include an exact fix version number, so a vendor-released patched version is not independently confirmed at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-41449 vulnerability details – vuln.today
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