CVE-2026-71285

8.1 HIGHpublic exploit available

Published 2026-08-05 · Updated 2026-08-10

AI risk analysis

Summary: The flaw allows unauthenticated visitors to execute arbitrary JavaScript, leading to potential session-cookie theft and full page takeover.
Exploitability: Exploitation is relatively easy once the admin-configurable Matomo value is set to a malicious payload.
Blast radius: If exploited, the impact could be severe, as it affects every unauthenticated visitor to the public /status/<slug> page.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Disable the Matomo analytics integration or ensure the Matomo value is properly quoted to prevent unquoted JavaScript execution.

rcewebjavascriptunquotedarbitrary-execution

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

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 vector

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

Weaknesses

CWE-79

Public exploit & PoC references

References

Data: NVD (public domain). Analysis: local $0 model. Defensive use only.