{"id":"GHSA-qgvj-qcf8-xq73","summary":"Backstage: Improper URL validation in catalog entity placeholder resolution","details":"### Impact\n\nAn authenticated Backstage user could craft a catalog entity with placeholder directives that reference resources outside the entity's source repository. Under certain configurations, this could allow access to data not intended to be available to the user.\n\n### Patches\n\nPatched in `@backstage/plugin-catalog-backend` version `3.9.1`\n\n### Workarounds\n\nIf you're not able to update immediately:\n\n- Limit the scope of integration credentials (e.g., GitHub tokens) to only the repositories that Backstage needs to access.","aliases":["CVE-2026-106498"],"modified":"2026-10-07T18:15:10.710570023Z","published":"2026-10-07T17:59:24Z","database_specific":{"github_reviewed_at":"2026-10-07T17:59:24Z","nvd_published_at":"2026-10-06T22:17:04Z","cwe_ids":["CWE-863","CWE-918"],"severity":"HIGH","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/backstage/backstage/security/advisories/GHSA-qgvj-qcf8-xq73"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106498"},{"type":"WEB","url":"https://github.com/backstage/backstage/commit/0b0f6fc89b4eb4872c76a498abbe1dc65998bb6e"},{"type":"WEB","url":"https://github.com/backstage/backstage/commit/286bfc1f9cc3608a073b41016be302785be385d1"},{"type":"WEB","url":"https://github.com/backstage/backstage/commit/61a10f19926aeda7f4a32de48d733e6710584634"},{"type":"WEB","url":"https://github.com/backstage/backstage/commit/99729e925fd2bd40ba210022351a0ee6318e6197"},{"type":"WEB","url":"https://github.com/backstage/backstage/commit/e786ac309ed2d775daf2309393c015c43902d6f6"},{"type":"PACKAGE","url":"https://github.com/backstage/backstage"},{"type":"WEB","url":"https://github.com/backstage/backstage/releases/tag/v1.49.6"},{"type":"WEB","url":"https://github.com/backstage/backstage/releases/tag/v1.50.5"},{"type":"WEB","url":"https://github.com/backstage/backstage/releases/tag/v1.51.3"},{"type":"WEB","url":"https://github.com/backstage/backstage/releases/tag/v1.53.2"},{"type":"WEB","url":"https://github.com/backstage/backstage/releases/tag/v1.54.6"}],"affected":[{"package":{"name":"@backstage/plugin-catalog-backend","ecosystem":"npm","purl":"pkg:npm/%40backstage/plugin-catalog-backend"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.9.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-qgvj-qcf8-xq73/GHSA-qgvj-qcf8-xq73.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"}]}