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Fireware OS CVE-2026-13373

| EUVDEUVD-2026-41448 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-07-02 WatchGuard GHSA-vxh9-mg9h-h952
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

High privileges required to store the payload; scope change applies as victim's browser session is impacted; no availability effect; low C/I reflecting typical stored XSS session 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 (Tigerpaw Technology Integration module) allows Stored XSS. This vulnerability is an additional unmitigated attack path for CVE-2025-13936.

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 XSS in WatchGuard Fireware OS's Tigerpaw Technology Integration module allows a high-privileged attacker to persist malicious scripts within the management interface, which then execute in the browsers of other authenticated users who visit the affected pages. Critically, this CVE is identified as an additional unmitigated attack path for CVE-2025-13936, indicating an incomplete remediation of a prior related XSS flaw in the same integration module. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Compromise or obtain high-privilege Fireware OS credentials
Delivery
Authenticate to management interface
Exploit
Inject stored XSS payload via Tigerpaw module input
Install
Payload persists in Fireware OS
C2
Victim administrator views affected management page
Execute
Malicious script executes in victim's browser
Impact
Steal session token or hijack admin actions
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Vulnerability AssessmentAI

Exploitation Exploitation requires the attacker to hold a high-privilege account on the Fireware OS management interface (CVSS PR:H confirmed). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 4.8 (Medium) reflects accurate risk calibration: PR:H constrains exploitation to already-authenticated, high-privileged users such as administrators, significantly limiting the attacker pool. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with high-privileged access to the Fireware OS management interface - such as a compromised administrator account or a malicious insider - injects a JavaScript payload into an input field within the Tigerpaw Technology Integration module. The payload is stored server-side and executes silently in the browser of any other authenticated administrator or user who subsequently navigates to the affected management page, potentially stealing their session token or performing administrative actions on their behalf. …
Remediation The primary remediation is to apply any patched Fireware OS version released by WatchGuard addressing WGSA-2026-00015, available at https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00015. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-13373 vulnerability details – vuln.today
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