CVE-2026-106491
mediumBackstage is an open framework for building developer portals.
Vendor / product: Linuxfoundation — backstage\/plugin-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-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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N Affected products
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- https://github.com/backstage/backstage/commit/233287d0ce3133e41549bf92a7470c940a41753c security-advisories@github.com
- https://github.com/backstage/backstage/releases/tag/v1.54.6 security-advisories@github.com
- https://github.com/backstage/backstage/security/advisories/GHSA-9ghw-48h5-v2w5 security-advisories@github.com