CVE-2026-71285: high-severity vulnerability in louislam uptime-kuma
Uptime Kuma Stored XSS via Matomo Analytics Site ID on Public Status Pages
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.1epss 0.4%
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
Affected products
louislam · uptime-kumaRelated CVEs — louislam uptime-kuma
In the same product, most dangerous first.
CVE-2023-36821HIGHUptime Kuma vulnerable to authenticated remote code execution via malicious plugin installationEPSS 2.0%CVE-2024-56331MEDIUMLocal File Inclusion (LFI) via Improper URL Handling in uptime-kuma's `Real-Browser` monitorEPSS 1.8%CVE-2023-36822MEDIUMUptime Kuma authenticated path traversal via plugin repository name may lead to unavailability or data lossEPSS 1.2%CVE-2026-32230MEDIUMUptime Kuma is Missing Authorization Checks on Ping Badge Endpoint, Leaks Ping times of monitors without needing to be on a status pageEPSS 1.0%CVE-2023-49276MEDIUMAttribute Injection leading to XSS(Cross-Site-Scripting) in uptime-kumaEPSS 0.5%CVE-2023-25811MEDIUMPersistent Cross site scripting (XSS) in Uptime KumaEPSS 0.5%