{"id":"CVE-2026-106491","revision":"081488533d4c4dcd98f6347bf79d2361","records":[{"revision":"081488533d4c4dcd98f6347bf79d2361","observedAt":"2026-10-25T04:17:41.466+00:00","statement":{"source":"nvd","id":"CVE-2026-106491","aliases":[],"title":"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…","description":"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.","state":0,"publishedAt":"2026-10-06T21:17:18.073+00:00","modifiedAt":"2026-10-22T14:10:06.117+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","score":6.4,"severity":"MEDIUM"}],"references":["https://github.com/backstage/backstage/commit/233287d0ce3133e41549bf92a7470c940a41753c","https://github.com/backstage/backstage/releases/tag/v1.54.6","https://github.com/backstage/backstage/security/advisories/GHSA-9ghw-48h5-v2w5"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-106491","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-20","CWE-22"],"productCriteria":["cpe:2.3:a:linuxfoundation:backstage\\/plugin-proxy-backend:*:*:*:*:*:node.js:*:*","cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-10-06T21:17:18.073","lastModified":"2026-10-22T14:10:06.117"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-106491","identifiers":["CVE-2026-106491"]},"retained":false,"historicalAffected":[]}],"coverage":[]}