CVE-2026-71285 — Uptime Kuma Stored XSS via Matomo Analytics Site ID on Public Status Pages
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 …
Published: 2026-08-05 · CVSS: 8.1 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7