EUVD-2026-18292
GHSA-424h-wx8h-m36j
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
3DescriptionCVE.org
Endian Firewall version 3.3.25 and prior allow stored cross-site scripting (XSS) via the remark parameter to /cgi-bin/dnat.cgi. An authenticated attacker can inject arbitrary JavaScript that is stored and executed when other users view the affected page.
AnalysisAI
Stored cross-site scripting in Endian Firewall 3.3.25 and prior allows authenticated users to inject malicious JavaScript via the remark parameter in /cgi-bin/dnat.cgi, which persists and executes when other administrators or users access the affected page. This requires valid login credentials but can compromise the integrity and confidentiality of management sessions for other users.
Technical ContextAI
The vulnerability stems from CWE-79 (Improper Neutralization of Input During Web Page Generation), indicating insufficient input sanitization or output encoding in the DNAT (Destination Network Address Translation) configuration interface. The remark parameter is stored in the application's backend without proper validation or encoding, allowing an authenticated user to submit JavaScript payloads that are later rendered unsafely when displayed to other authenticated users. This is a stored XSS variant (persistent XSS), meaning the malicious payload remains in the application's data store indefinitely until manually removed.
RemediationAI
Upgrade Endian Firewall to a version released after 3.3.25 that includes patches for this XSS vulnerability. Consult Endian's advisory and release notes at https://help.endian.com/hc/en-us/sections/360004371358-Community to identify the specific patched version available for your deployment. As an interim workaround pending patching, restrict administrative console access to trusted networks via firewall ACLs, enforce multi-factor authentication for management accounts, and audit existing DNAT rules for any suspicious remarks or JavaScript payloads. Additionally, consider monitoring or filtering the remark field input via Web Application Firewall (WAF) rules to block common XSS payloads (e.g., script tags, event handlers) until the patch is deployed.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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