CVE-2026-106491 — Backstage: Improper input validation in proxy-backend
Backstage is an open framework for building developer portals. Prior to 0.6.17, the @backstage/plugin-proxy-backend package is affected by improper input validation in proxy-bac…
Published: 2026-10-06 · CVSS: 6.4 · CVSS 3.1
Backstage is an open framework for building developer portals. Prior to 0.6.17, the @backstage/plugin-proxy-backend package is affected by improper input validation in proxy-backend. An authenticated Backstage user could craft a request URL that causes the proxy-backend to forward the request to a path outside the configured base path on the target server. This is limited to target servers already configured as proxy endpoints and requires Backstage authentication by default. This issue is fixed in version 0.6.17.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7