{"id":"EUVD-2026-93989","revision":"08bace833cd34a2fb37734770842af13","records":[{"revision":"08bace833cd34a2fb37734770842af13","observedAt":"2026-10-30T01:52:15.357+00:00","statement":{"source":"euvd","id":"EUVD-2026-93989","aliases":["CVE-2026-106456","GHSA-472h-9c5j-prrr"],"title":"Backstage is an open framework for building developer portals. From 0.5.0 until 0.6.18, the @backstage/plugin-proxy-backend package is affected by inconsistent credential enforcement for overlapping proxy routes. An operator can configure o…","description":"Backstage is an open framework for building developer portals. From 0.5.0 until 0.6.18, the @backstage/plugin-proxy-backend package is affected by inconsistent credential enforcement for overlapping proxy routes. An operator can configure overlapping proxy paths with different credential requirements. When a parent path permits unauthenticated access and a nested path requires credentials, the parent exemption can also cover requests handled by the nested proxy. An unauthenticated caller may therefore reach the nested upstream through Backstage, including with static upstream credentials configured for that proxy. This issue is fixed in version 0.6.18.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","score":4.8,"severity":null}],"references":["https://github.com/backstage/backstage/security/advisories/GHSA-472h-9c5j-prrr","https://github.com/backstage/backstage/commit/9df92923ac32558bb80edeceafd8de780c44e218","https://github.com/backstage/backstage/releases/tag/v1.55.0"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-93989","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Oct 6, 2026, 8:10:41 PM","dateUpdated":"Oct 7, 2026, 6:24:34 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-93989","identifiers":["EUVD-2026-93989","CVE-2026-106456","GHSA-472h-9c5j-prrr"]},"retained":false,"historicalAffected":[]}],"coverage":[]}