XSS in Netdata
CVE-2025-71385
Netdata before 2.3.1 reflects the user-supplied love query parameter of the api/v2/ilove.svg and api/v3/ilove.svg endpoints verbatim into the generated SVG document (into a text element) without HTML or XML escaping, and serves the response with Content-Type image/svg+xml. An attacker can craft a URL such as /api/v2/ilove.svg?love=<script>...</script>; when a victim navigates to it the injected script executes in the victim browser in the origin of the Netdata instance (reflected cross-site scripting). These endpoints are registered with HTTP_ACL_NOCHECK and anonymous access and, because bearer-token protection is disabled by default, are reachable without authentication on a default Netdata agent. The issue was resolved by removing the ilove endpoint.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.002 (14.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Netdata — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (Patch, patch)
- disclosure@vulncheck.com (issue-tracking, Patch, Issue Tracking)
- disclosure@vulncheck.com (release-notes, Product, Release Notes)
- disclosure@vulncheck.com (Patch, Third Party Advisory, Release Notes, third-party-advisory)
Frequently asked questions
- What is CVE-2025-71385?
- CVE-2025-71385 is a medium-severity vulnerability in Netdata, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-07-02.
- How severe is CVE-2025-71385?
- Medium severity. CVSS v3 base score is 6.1 out of 10.