要点
- CVE-2026-106491 は backstage (linuxfoundation), backstage/plugin-proxy-backend (linuxfoundation), @backstage/plugin-proxy-backend に影響する深刻度「中」 (CVSS 6.4) の脆弱性です。
- 今後30日間に悪用される確率（EPSS）：0.27%（全脆弱性の 19.9% より高い）。
- 対処：1.54.6, 0.6.17 以降に更新してください。
概要
Impact
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.
Patches
Patched in @backstage/plugin-proxy-backend version 0.6.17
Workarounds
- Deploy a reverse proxy or WAF in front of Backstage that normalizes request paths before they reach the backend.
NVD の説明
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.
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