CVE-2026-39936

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{"affected": [{"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "1.43.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "1.44.4"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "1.45.2"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Mediawiki - Score Extension", "source": "cna", "vendor": "The Wikimedia Foundation"}, "product": "mediawiki-score_extension", "vendor": "wikimedia"}], "analysis": {"en": {"generated_at": "2026-04-08T23:26:26.939429+00:00", "value": {"mitigation_remediation": ["Upgrade MediaWiki to version 1.45 or later, ensuring the Score extension is updated from the master branch.", "Verify that the Score extension has been patched by checking the current extension code for the latest commit.", "If updates cannot be applied immediately, restrict who can submit data to the Score extension and consider disabling the extension until a fix is available."], "summary": {"action": "Patch", "impact": "Stored Cross\u2011Site Scripting"}, "threat_synthesis": {"affected_systems": "The flaw affects the Wikimedia Foundation\u2019s MediaWiki Score extension across the MediaWiki 1.43, 1.44, and 1.45 release branches. Any installation that uses the Score extension and has not applied the fix from the master branch is vulnerable. The issue was addressed in the current master and the official release branches for the mentioned MediaWiki versions.", "description_and_impact": "The vulnerability is a stored cross\u2011site scripting flaw in the MediaWiki Score extension, caused by the use of non\u2011reserved data attributes that are not properly escaped when generating web pages. Because the input is stored and later rendered without neutralization, an attacker who can insert arbitrary data into a Score entry can cause the victim\u2019s browser to execute malicious JavaScript, potentially enabling theft of session cookies, defacement of the page, or other client\u2011side compromise of confidentiality and integrity for any user who views the affected content.", "risk_and_exploitability": "The CVSS score of 6.9 places it in the high severity range, but the EPSS score is below 1\u202f% and the vulnerability is not listed in the CISA KEV catalog, suggesting limited current exploitation activity. Attackers would typically need to supply data via the Score extension\u2019s input interface, which, if exposed to untrusted users, provides a remote attack vector that can be leveraged from any connected client. While the impact is contained to the victim\u2019s browser, the widespread nature of MediaWiki installations means the potential attack surface is large."}}}}, "created": "2026-04-08T19:45:13.692268+00:00", "updated": "2026-04-09T08:28:34.897302+00:00", "vendors": ["wikimedia", "wikimedia$PRODUCT$mediawiki-score_extension"]}