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TI-2026-49952 Aliases CVE-2026-71285GHSA-pf4v-rpp4-fp6r

Uptime Kuma Stored XSS via Matomo Analytics Site ID on Public Status Pages

Priority LOW 37CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00382 32nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
louislamuptime-kumaup to 2.4.0—No fix listedCNA
  • uptime-kuma Vendorlouislam Affected up to 2.4.0 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-71285
  2. 2026-10-03 Alias added: GHSA-pf4v-rpp4-fp6r

References

Advisory 2

  • TI-2026-51249 Path traversal in louislam dockge CVSS 4.0HIGH 8.7
  • TI-2024-37292 Local File Inclusion (LFI) via Improper URL Handling in uptime-kuma's `Real-Browser` monitor CVSS 3.1MEDIUM 6.8
  • TI-2026-83016 Race condition in Uptime Kuma lets attackers create extra admins CVSS 4.0MEDIUM 6.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences