CVE-2026-71285

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "uptime-kuma", "programFiles": ["server/analytics/matomo-analytics.js"], "vendor": "louislam", "versions": [{"lessThanOrEqual": "2.4.0", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Uptime Kuma's Matomo analytics integration (server/analytics/matomo-analytics.js) injects the admin-configurable Matomo value as a bare, unquoted JavaScript expression inside a <script> block rendered on every public status page. A siteId value such as , once saved by an editor/admin, executes arbitrary JavaScript for every unauthenticated visitor of the public /status/<slug> page, enabling session-cookie theft and full page takeover."}, {"lang": "es", "value": "La integraci\u00f3n de an\u00e1lisis Matomo de Uptime Kuma (servidor/analytics/matomo-analytics.js) inyecta el valor \u201csiteId\u201d de Matomo configurable por el administrador como una expresi\u00f3n JavaScript sin formato y sin comillas dentro de un bloque [script_tag] renderizado en cada p\u00e1gina de estado p\u00fablica: \u201c_paq.push([\u2019setSiteId\u2019, ${escapedSiteIdHTMLAttribute}]);\u201d. La cadena de escape utilizada (jsesc con isScriptContext:true, luego html-escaper.escape()) no escapa los caracteres \u201c]\u201d, \u201c)\u201d, \u201c;\u201d, \u201c(\u201d, que son suficientes para salir del contexto de la expresi\u00f3n de array/push. Un valor de siteId como \u201c1]);alert(document.cookie)//\u201d, una vez guardado por un editor/administrador, ejecuta JavaScript arbitrario para cada visitante no autenticado de la p\u00e1gina p\u00fablica /status/[slug], permitiendo el robo de cookies de sesi\u00f3n y la toma de control completa de la p\u00e1gina."}], "id": "CVE-2026-71285", "lastModified": "2026-10-23T21:10:00.157", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.7, "impactScore": 5.8, "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-71285", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-08-05T15:52:03.249974Z", "version": "2.0.3"}}]}, "published": "2026-08-05T13:24:53.210", "references": [{"source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "url": "https://github.com/louislam/uptime-kuma"}, {"source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "url": "https://github.com/louislam/uptime-kuma/blob/master/server/analytics/matomo-analytics.js"}], "sourceIdentifier": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.4.0]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "uptime-kuma", "source": "cna", "vendor": "louislam"}, "product": "uptime-kuma", "vendor": "louislam"}], "created": "2026-08-05T15:00:05.312297+00:00", "updated": "2026-08-10T21:30:04.094024+00:00", "vendors": ["louislam", "louislam$PRODUCT$uptime-kuma"]}