{"cve":"CVE-2026-106498","nvd":{"published":"2026-10-06T22:17:04.713","modified":"2026-10-16T15:22:13.790","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","score":7.7},"cwes":["CWE-863","CWE-918"],"references":["https://github.com/backstage/backstage/commit/0b0f6fc89b4eb4872c76a498abbe1dc65998bb6e","https://github.com/backstage/backstage/commit/286bfc1f9cc3608a073b41016be302785be385d1","https://github.com/backstage/backstage/commit/61a10f19926aeda7f4a32de48d733e6710584634","https://github.com/backstage/backstage/commit/99729e925fd2bd40ba210022351a0ee6318e6197","https://github.com/backstage/backstage/commit/e786ac309ed2d775daf2309393c015c43902d6f6"],"products":["linuxfoundation:backstage","linuxfoundation:backstage_plugin-catalog-backend"],"source":"nvd","synced_at":"2026-10-19T22:58:01.639778232+00:00"},"epss":{"cve":"CVE-2026-106498","score":0.00307,"percentile":0.23271,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-qgvj-qcf8-xq73","url":"https://osv.dev/vulnerability/GHSA-qgvj-qcf8-xq73","summary":"Backstage: Improper URL validation in catalog entity placeholder resolution","modified":"2026-10-07T18:15:10.710570023Z","packages":[{"ecosystem":"npm","name":"@backstage/plugin-catalog-backend","purl":"pkg:npm/%40backstage/plugin-catalog-backend","ranges":["<3.9.1"],"fixed":["3.9.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}