EUVD-2026-41451
GHSA-35hv-3mxg-g72p
Severity by source
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
Network-accessible management UI with high privileges required for injection and required victim interaction triggering limited cross-scope browser impact.
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
Lifecycle Timeline
1DescriptionCVE.org
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WatchGuard Fireware OS spamBlocker module allows Stored XSS. This vulnerability is an additional unmitigated attack path for CVE-2025-1071.
This issue affects Fireware OS 12.0 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 spamBlocker module enables a high-privileged attacker to persist malicious JavaScript that executes in the browsers of other authenticated users viewing the affected management interface. This vulnerability is explicitly identified as an additional, unmitigated attack path bypassing the remediation applied for CVE-2025-1071, indicating the original fix was incomplete. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold high-privilege credentials on the Fireware OS management interface (CVSS 4.0 PR:H), meaning a compromised or malicious administrator account is a prerequisite - this is a meaningful limiting factor that rules out unauthenticated external attackers. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The overall real-world risk is moderate-to-low for most environments. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained or compromised a high-privilege administrator account on a WatchGuard Fireware OS appliance navigates to the spamBlocker module configuration and stores a crafted JavaScript payload within an unsanitized field. When a second administrator subsequently loads the affected spamBlocker management page, the browser executes the attacker's script, potentially exfiltrating the victim's session cookie or performing unauthorized configuration changes under the victim's identity. … |
| Remediation | Consult WatchGuard's advisory WGSA-2026-00018 at https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00018 for the vendor-released patch - no specific fixed version number was included in the available intelligence, so the advisory should be treated as the authoritative source. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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