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.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/netdata/netdata/commit/f82554fe9b21b5ae51a8663a3f4ddce84cac16af Patch
- https://github.com/netdata/netdata/pull/19919 Issue Tracking, Patch
- https://www.vulncheck.com/advisories/netdata-reflected-cross-site-scripting-via-love-parameter-in-ilove-svg-endpoint Patch, Release Notes, Third Party Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 5.1 · netdataNVD modified 2026-10-12 21:10
Affected (CPE criteria) 1
cpe:2.3:a:netdata:netdata:*:*:*:*:*:*:*:*
References 4
- https://github.com/netdata/netdata/commit/f82554fe9b21b5ae51a8663a3f4ddce84cac16af Patch
- https://github.com/netdata/netdata/pull/19919 Issue Tracking, Patch
- https://github.com/netdata/netdata/releases/tag/v2.3.1 Product, Release Notes
- https://www.vulncheck.com/advisories/netdata-reflected-cross-site-scripting-via-love-parameter-in-ilove-svg-endpoint Patch, Release Notes, Third Party Advisory