CVE-2026-71285
Uptime Kuma Stored XSS via Matomo Analytics Site ID on Public Status Pages
- Published
- Aug 5, 2026
- Updated
- Aug 10, 2026
- Assigning CNA
- TuranSec
- Evidence observed
- Aug 29, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:NLow · next 30 days
- Percentile
- 13.8%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
1- 1day-archiveResearch
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Responsible use
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