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Vulnerability record · CVE-2026-71285 · published 5 August 2026

CVE-2026-71285: Cross-site scripting vulnerability

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.

8.1 CVSS 3.1 High EPSS 0.38% · top 70.4% CWE-79 · Cross-site scripting Deferred
8.1CVSS 3.1 base score
0.38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
26 Aug 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-71285), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.