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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "3.3.25"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Endian Firewall", "source": "cna", "vendor": "Endian"}, "product": "firewall", "vendor": "endian"}], "analysis": {"en": {"generated_at": "2026-04-02T16:22:32.261729+00:00", "value": {"mitigation_remediation": ["Upgrade Endian Firewall to a patched release that eliminates the stored XSS vulnerability in /cgi-bin/proxyuser.cgi.", "If an upgrade is not immediately feasible, restrict or disable access to /cgi-bin/proxyuser.cgi, and validate or sanitize the 'user' parameter to prevent script injection.", "Monitor firewall logs for unusual use of the proxyuser.cgi endpoint and apply additional security controls as needed."], "summary": {"action": "Immediate Patch", "impact": "Stored Cross\u2011Site Scripting (arbitrary JavaScript execution)"}, "threat_synthesis": {"affected_systems": "Affected versions of Endian Firewall include releases 2.1.2, 2.4 and 3.3.25 and prior, as indicated by the vulnerable CPEs. These products expose the /cgi-bin/proxyuser.cgi endpoint to authenticated users, allowing the injection described above.", "description_and_impact": "The flaw allows an authenticated user to embed arbitrary JavaScript into the 'user' field of /cgi-bin/proxyuser.cgi. When other users view the page, the stored script executes in their browsers. Because the script runs with the victim\u2019s credentials, an attacker can hijack sessions, divulge sensitive data or perform actions on behalf of the user, effectively executing code in the user\u2019s context. This stored cross\u2011site scripting attack corresponds to CWE\u201179.", "risk_and_exploitability": "The CVSS score of 5.1 places the vulnerability in the medium severity range. Exploitation requires legitimate authentication and the ability to view the affected page, but no additional privileges are needed. No EPSS data is available, and the flaw is not listed in CISA\u2019s KEV catalog. Nonetheless, because the attacker can run arbitrary code in victims\u2019 browsers, organizations with access to Endian Firewall should treat it as a significant risk, especially in environments with sensitive user sessions."}}}}, "created": "2026-04-02T20:11:50.027911+00:00", "updated": "2026-04-02T20:20:31.558647+00:00", "vendors": ["endian", "endian$PRODUCT$firewall"]}