High severity · published Aug 5, 2026
CVE-2026-71285
Uptime Kuma Stored XSS via Matomo Analytics Site ID on Public Status Pages
8.1
CVSS
0.4%
EPSS
No
On KEV
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
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UP
uptime-kuma · louislam
through 2.4.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-71285
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-71285
github.com
https://github.com/louislam/uptime-kuma
github.com
https://github.com/louislam/uptime-kuma/blob/master/server/analytics/matomo-analytics.js
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