CVE-2026-106491Backstage: Improper input validation in proxy-backend

Descripción

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.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• https://github.com/backstage/backstage/security/advisories/GHSA-9ghw-48h5-v2w5 MitigationVendor Advisory
• https://github.com/backstage/backstage/commit/233287d0ce3133e41549bf92a7470c940a41753c Patch
• https://github.com/backstage/backstage/releases/tag/v1.54.6 PatchRelease Notes