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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,3.1 Update 13]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "Express", "source": "cna", "vendor": "Smoothwall"}, "product": "express", "vendor": "smoothwall"}], "analysis": {"en": {"generated_at": "2026-03-30T18:51:01.277407+00:00", "value": {"mitigation_remediation": ["Upgrade Smoothwall Express to version 3.1 Update 13 or later", "If an upgrade is not immediately possible, disable or remove the \"/redirect.cgi\" endpoint from the web server", "Add a server\u2011side filter to reject URLs that use the \"javascript:\" scheme or otherwise sanitize the \"url\" parameter", "Validate that the web application no longer reflects unsanitized user input in the browser", "Monitor web traffic and logs for attempts to exploit the \"/redirect.cgi\" endpoint"], "summary": {"action": "Apply Patch", "impact": "Cross\u2011Site Scripting"}, "threat_synthesis": {"affected_systems": "All installations of Smoothwall Express released before version 3.1 Update 13 are susceptible. Any instance that still hosts the \"/redirect.cgi\" page and processes the \"url\" parameter without validation is exposed.", "description_and_impact": "Smoothwall Express versions earlier than 3.1 Update 13 allow an attacker to insert malicious JavaScript code through the unfiltered \"url\" query parameter of the \"/redirect.cgi\" endpoint. When a victim clicks the crafted link, the browser executes the script in the context of the application, enabling the attacker to steal session cookies, hijack the user session, or display phishing pages. The weakness is a classic reflected XSS flaw that arises from improper input sanitization.", "risk_and_exploitability": "The CVSS score of 5.1 indicates a moderate severity. Exploitation requires a victim to open a malicious link, meaning it is an interactive remote web\u2011based attack. No EPSS score is available and the vulnerability is not listed in the CISA KEV catalog. Overall the risk is moderate but still significant for environments where users regularly click URLs that may be compromised."}}}}, "created": "2026-03-30T20:55:29.110867+00:00", "updated": "2026-03-31T20:40:38.357465+00:00", "vendors": ["smoothwall", "smoothwall$PRODUCT$express"]}