🛡️ CVE-2026-71285

🟠 CVSS 8.1 — High ✅ No Known Exploit CWE-79 NVD
8.1
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs administrative privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability none.

Weakness class

CVE-2026-71285 is classified as CWE-79: Cross-site Scripting (XSS). User-supplied data is written into a page without escaping, so attacker script runs in the browser of anyone who views it.

Affected software

CVE-2026-71285 is recorded against 1 package.

  • unknown

Timeline and source

Published on 5 August 2026 and last revised on 10 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com
github.com

Details

Severity HIGH
CVSS Score 8.1
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N
CWE CWE-79
Public Exploit ✅ No
Source NVD
Published 2026-08-05
Updated 2026-08-11
Modified 2026-08-10
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —

Similar Threats

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