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CVE-2026-71285
No affected components available
Uptime Kuma's Matomo analytics integration (server/analytics/matomo-analytics.js) injects the admin-configurable Matomo siteId value as a bare, unquoted JavaScript expression inside a <script> block rendered on every public status page: _paq.push(['setSiteId', ${escapedSiteIdHTMLAttribute}]);. The escaping pipeline used (jsesc with isScriptContext:true, then html-escaper.escape()) does not escape the characters ], ), ;, (, which are sufficient to break out of the array/push expression context. A siteId value such as 1]);alert(document.cookie)//, 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.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. The attacker needs the user to perform some action, like clicking a link. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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