CVE-2026-71285
Uptime Kuma Stored XSS via Matomo Analytics Site ID on Public Status Pages
- State
- Published
- Severity
- 8.1 High
- Published
- Aug 5, 2026
- Updated
- Aug 10, 2026
- Reserved
- Aug 5, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.1 High | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N | TuranSec |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
uptime-kumalouislam |
|
References
- https://github.com/louislam/uptime-kumathird-party-advisory
- https://github.com/louislam/uptime-kuma/blob/master/server/analytics/matomo-analytics.jsthird-party-advisory
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