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CVE-2026-71285— Uptime Kuma Stored XSS via Matomo Analytics Site ID on Public Status Pages

Quick assessment

Affected
louislam uptime-kuma
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Louis Lam Uptime Kuma是Louis Lam个人开发者开源的一款自托管的监控工具。 Louis Lam Uptime Kuma 2.4.0及之前版本存在跨站脚本漏洞，该漏洞源于Matomo analytics集成（server/analytics/matomo-analytics.js）中siteId参数处理不当，未正确转义JavaScript表达式中的特殊字符，可能导致跨站脚本攻击，窃取会话cookie并完全接管页面。

CVSS 8.1 · High EPSS 0.38% · P29

Affected Version Matrix 1

VendorProduct Version RangeStatus
louislam uptime-kuma ≤ 2.4.0 affected
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I. Basic Information for CVE-2026-71285

Vulnerability Information
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Vulnerability Title
Uptime Kuma Stored XSS via Matomo Analytics Site ID on Public Status Pages
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Louis Lam Uptime Kuma 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Louis Lam Uptime Kuma是Louis Lam个人开发者开源的一款自托管的监控工具。 Louis Lam Uptime Kuma 2.4.0及之前版本存在跨站脚本漏洞，该漏洞源于Matomo analytics集成（server/analytics/matomo-analytics.js）中siteId参数处理不当，未正确转义JavaScript表达式中的特殊字符，可能导致跨站脚本攻击，窃取会话cookie并完全接管页面。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
louislam uptime-kuma 0 ~ 2.4.0 -

II. Public POCs for CVE-2026-71285

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 5869 chars
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III. Intelligence Information for CVE-2026-71285

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Vendor Pages for CVE-2026-71285 (1)

Other References for CVE-2026-71285 (1)

IV. Related Vulnerabilities

Same product: uptime-kuma
Same vendor: louislam
Same weakness: CWE-79

V. Comments for CVE-2026-71285

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