Vulnerability · Published Aug 5, 2026 · Assigned by TuranSec

CVE-2026-71285Uptime Kuma Stored XSS via Matomo Analytics Site ID on Public Status Pages

High 8.1

In plain English

A high-severity cross-site scripting in uptime-kuma from louislam. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.4%top 67.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
louislam	uptime-kuma	0 – through 2.4.0

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N

References

https://github.com/louislam/uptime-kuma third-party-advisory
https://github.com/louislam/uptime-kuma/blob/master/server/analytics/matomo-analytics.js third-party-advisory