{"id":"CVE-2026-106498","summary":"Backstage: Improper URL validation in catalog entity placeholder resolution","details":"Backstage is an open framework for building developer portals. Prior to 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1, the @backstage/plugin-catalog-backend package is affected by improper url validation in catalog entity placeholder resolution. An 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. This issue is fixed in versions 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1.","aliases":["GHSA-qgvj-qcf8-xq73"],"modified":"2026-10-07T10:46:47.580816479Z","published":"2026-10-06T21:23:37.560Z","database_specific":{"cwe_ids":["CWE-863","CWE-918"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106498.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"fixed":"3.5.1"},{"introduced":"3.6.0"},{"fixed":"3.6.2"},{"introduced":"3.7.0"},{"fixed":"3.7.2"},{"introduced":"3.8.0"},{"fixed":"3.8.2"},{"introduced":"3.9.0"},{"fixed":"3.9.1"}]}],"cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106498.json"},{"type":"FIX","url":"https://github.com/backstage/backstage/commit/0b0f6fc89b4eb4872c76a498abbe1dc65998bb6e"},{"type":"FIX","url":"https://github.com/backstage/backstage/commit/286bfc1f9cc3608a073b41016be302785be385d1"},{"type":"FIX","url":"https://github.com/backstage/backstage/commit/61a10f19926aeda7f4a32de48d733e6710584634"},{"type":"FIX","url":"https://github.com/backstage/backstage/commit/99729e925fd2bd40ba210022351a0ee6318e6197"},{"type":"FIX","url":"https://github.com/backstage/backstage/commit/e786ac309ed2d775daf2309393c015c43902d6f6"},{"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"},{"type":"ADVISORY","url":"https://github.com/backstage/backstage/security/advisories/GHSA-qgvj-qcf8-xq73"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106498"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/backstage/backstage","events":[{"introduced":"0"},{"fixed":"e8c20440640d1d2baffbf6e44a71e6960e5eb2ec"},{"introduced":"f29d18c2fd55f0448f0fbaf8525178676dccd52d"},{"fixed":"f3e982bd0530f51760c8a70d21eafaa7aed2e6eb"},{"introduced":"e2fdc2b61fe9046574a8fc1d99b18053018db0a8"},{"fixed":"788f477f539d9c38fcf33825fb85805362c20fc0"},{"introduced":"65456c31b62e3cc88777a1771c28f38f0ad896da"},{"fixed":"ed841d1eeb744b9c78726580202cfaffcaed8db0"},{"introduced":"3aa8f7c87c6f2ad08c850844428f647bdca8a016"},{"fixed":"0e67bc1fc88fba3a8cb716d3584cef05ecbcf9a8"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"fixed":"1.49.6"},{"introduced":"1.50.0-next.0"},{"fixed":"1.50.5"},{"introduced":"1.51.0-next.0"},{"fixed":"1.51.3"},{"introduced":"1.52.0-next.0"},{"fixed":"1.53.2"},{"introduced":"1.54.0-next.0"},{"fixed":"1.54.6"}]}}],"versions":["v1.51.2","v1.50.4","v1.49.5","v1.54.5","v1.54.4","v1.54.3","v1.54.2","v1.54.1","v1.54.0","v1.54.0-next.3","v1.54.0-next.2","v1.53.1","v1.53.0","v1.54.0-next.1","v1.54.0-next.0","v1.53.0-next.2","v1.53.0-next.1","v1.52.0","v1.53.0-next.0","v1.52.0-next.2","v1.52.0-next.1","v1.51.1","v1.51.0","v1.52.0-next.0","v1.51.0-next.3","v1.51.0-next.2","v1.51.0-next.1","v1.50.3","v1.51.0-next.0","v1.50.2","v1.50.1","v1.49.4","v1.50.0","v1.50.0-next.2","v1.49.3","v1.50.0-next.1","v1.49.2","v1.50.0-next.0","v1.49.1","v1.49.0","v1.49.0-next.2","v1.49.0-next.1","v1.49.0-next.0","v1.48.0","v1.48.0-next.2","v1.48.0-next.1","v1.48.0-next.0","v1.47.0","v1.47.0-next.3","v1.47.0-next.2","v1.47.0-next.1","v1.47.0-next.0","v1.46.0","v1.45.0-next.2","v1.46.0-next.2","v1.46.0-next.1","v1.45.0","v1.46.0-next.0","v1.45.0-next.3","v1.45.0-next.1","v1.45.0-next.0","v1.44.0","v1.44.0-next.1","v1.44.0-next.2","v1.44.0-next.0","v1.43.0","v1.43.0-next.2","v1.43.0-next.0","v1.43.0-next.1","v1.42.0","v1.44.0-next.3","v1.42.0-next.3","v1.42.0-next.2","v1.42.0-next.1","v1.42.0-next.0","v1.41.0","v1.41.0-next.2","v1.41.0-next.1","v1.41.0-next.0","v1.40.0","v1.40.0-next.3","v1.40.0-next.2","v1.39.0","v1.40.0-next.1","v1.40.0-next.0","v1.39.0-next.3","v1.39.0-next.2","v1.39.0-next.1","v1.39.0-next.0","v1.38.0","v1.38.0-next.2","v1.37.0","v1.38.0-next.1","v1.38.0-next.0","v1.37.0-next.2","v1.37.0-next.1","v1.37.0-next.0","v1.36.0","v1.36.0-next.3","v1.35.0","v1.36.0-next.2","v1.36.0-next.1","v1.36.0-next.0","v1.35.0-next.2","v1.35.0-next.1","v1.35.0-next.0","v1.34.0","v1.34.0-next.2","v1.34.0-next.1","v1.34.0-next.0","v1.33.0","v1.33.0-next.3","v1.33.0-next.2","v1.33.0-next.1","v1.33.0-next.0","v1.32.0","v1.32.0-next.2","v1.32.0-next.1","v1.32.0-next.0","v1.31.0","v1.31.0-next.2","v1.31.0-next.1","v1.31.0-next.0","v1.30.0","v1.30.0-next.4","v1.30.0-next.3","v1.30.0-next.2","v1.30.0-next.1","v1.30.0-next.0","v1.29.0","v1.29.0-next.2","v1.29.0-next.1","v1.29.0-next.0","v1.28.0","v1.28.0-next.3","v1.28.0-next.1","v1.28.0-next.2","v1.28.0-next.0","v1.27.0","v1.27.0-next.2","v1.27.0-next.1","v1.27.0-next.0","v1.26.0","v1.26.0-next.1","v1.25.0","v1.26.0-next.0","v1.24.2","v1.24.1","v1.24.0","v1.24.0-next.2","v1.24.0-next.1","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