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    <lastBuildDate>Wed, 30 Sep 2026 22:39:40 +0000</lastBuildDate>
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      <title>CVE-2026-71285 — Uptime Kuma Stored XSS via Matomo Analytics Site ID on Public Status Pages</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-71285</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; louislam uptime-kuma&lt;/p&gt;
&lt;p&gt;Uptime Kuma&amp;#39;s Matomo analytics integration (server/analytics/matomo-analytics.js) injects the admin-configurable Matomo value as a bare, unquoted JavaScript expression inside a &amp;lt;script&amp;gt; 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/&amp;lt;slug&amp;gt; page, enabling session-cookie theft and full page takeover.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; louislam uptime-kuma&lt;/p&gt;
&lt;p&gt;Uptime Kuma&amp;#39;s Matomo analytics integration (server/analytics/matomo-analytics.js) injects the admin-configurable Matomo value as a bare, unquoted JavaScript expression inside a &amp;lt;script&amp;gt; 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/&amp;lt;slug&amp;gt; page, enabling session-cookie theft and full page takeover.&lt;/p&gt;</content:encoded>
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