What is CVE-2026-71285?

CVE-2026-71285 is a high-severity vulnerability in Louislam Uptime-Kuma, classified under Cross-site Scripting. CVSS score: 8.1/10. Published 2026-08-05.

How severe is CVE-2026-71285?

High severity. CVSS v3 base score is 8.1 out of 10.

XSS in Louislam Uptime-Kuma

CVE-2026-71285

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (13.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N.

Affected products

Louislam Uptime-kuma — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (third-party-advisory)
309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (third-party-advisory)

Frequently asked questions

What is CVE-2026-71285?: CVE-2026-71285 is a high-severity vulnerability in Louislam Uptime-Kuma, classified under Cross-site Scripting. CVSS score: 8.1/10. Published 2026-08-05.
How severe is CVE-2026-71285?: High severity. CVSS v3 base score is 8.1 out of 10.