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{"analysis": {"en": {"generated_at": "2026-04-18T16:39:33.770851+00:00", "value": {"mitigation_remediation": ["Upgrade the Monaco skin to a version that corrects the XSS issue once available; if no fixed release exists, disable or remove the Monaco skin from the MediaWiki installation.", "Implement strict content\u2011security\u2011policy headers to restrict execution of inline scripts and disallow unsafe\u2011eval.", "Ensure all user\u2011generated and i18n strings are properly escaped or encoded before rendering; consider applying a library such as DOMPurify to sanitize output."], "summary": {"action": "Patch", "impact": "Cross\u2011Site Scripting (XSS)"}, "threat_synthesis": {"affected_systems": "Vendors and products impacted include The Wikimedia Foundation\u2019s MediaWiki platform when using the Monaco skin. The skin versions explicitly listed\u20141.45, 1.44, 1.43, and 1.39\u2014are vulnerable. Users running any of those versions should review their deployment of the Monaco skin.\n", "description_and_impact": "The vulnerability arises from improper neutralization of user\u2011supplied content in the Monaco skin of MediaWiki, allowing malicious actors to inject and execute arbitrary script code on page loads. This flaw can lead to theft of session cookies, defacement of content, or redirection to phishing sites. The weakness is categorized as CWE\u201179 and is considered a classic XSS bug. No denial of service or configuration SQL injection is reported in the official description.\n", "risk_and_exploitability": "The CVSS score of 2.3 indicates a low severity assessment, and the EPSS score of less than 1% suggests a very low likelihood of exploitation in the wild. The issue is not listed in CISA\u2019s KEV catalog, further underscoring its limited threat. Attackers would need to attract browsers to a page rendered with the vulnerable skin, which typically involves social engineering or compromised content. Because the flaw resides in the rendering layer and not in authentication or authorization, reach is limited to visitors to affected pages.\n"}}}}, "created": "2026-01-09T13:24:10.369701+00:00", "updated": "2026-04-18T16:45:05.225072+00:00", "vendors": ["mediawiki", "mediawiki$PRODUCT$mediawiki", "wikimedia", "wikimedia$PRODUCT$mediawiki-monaco_skin"]}