{"id":"CVE-2026-106498","published":"2026-10-06T22:17:04.713","lastModified":"2026-10-09T02:17:00.627","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.","cvssScore":7.7,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","cwes":["CWE-863","CWE-918"],"vendors":[],"products":[],"references":[{"url":"https://github.com/backstage/backstage/commit/0b0f6fc89b4eb4872c76a498abbe1dc65998bb6e","tags":[]},{"url":"https://github.com/backstage/backstage/commit/286bfc1f9cc3608a073b41016be302785be385d1","tags":[]},{"url":"https://github.com/backstage/backstage/commit/61a10f19926aeda7f4a32de48d733e6710584634","tags":[]},{"url":"https://github.com/backstage/backstage/commit/99729e925fd2bd40ba210022351a0ee6318e6197","tags":[]},{"url":"https://github.com/backstage/backstage/commit/e786ac309ed2d775daf2309393c015c43902d6f6","tags":[]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.49.6","tags":[]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.50.5","tags":[]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.51.3","tags":[]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.53.2","tags":[]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.54.6","tags":[]},{"url":"https://github.com/backstage/backstage/security/advisories/GHSA-qgvj-qcf8-xq73","tags":[]}],"exploitRefs":[{"url":"https://github.com/backstage/backstage/commit/0b0f6fc89b4eb4872c76a498abbe1dc65998bb6e","tags":[]},{"url":"https://github.com/backstage/backstage/commit/286bfc1f9cc3608a073b41016be302785be385d1","tags":[]},{"url":"https://github.com/backstage/backstage/commit/61a10f19926aeda7f4a32de48d733e6710584634","tags":[]},{"url":"https://github.com/backstage/backstage/commit/99729e925fd2bd40ba210022351a0ee6318e6197","tags":[]},{"url":"https://github.com/backstage/backstage/commit/e786ac309ed2d775daf2309393c015c43902d6f6","tags":[]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.49.6","tags":[]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.50.5","tags":[]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.51.3","tags":[]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.53.2","tags":[]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.54.6","tags":[]},{"url":"https://github.com/backstage/backstage/security/advisories/GHSA-qgvj-qcf8-xq73","tags":[]}],"hasPoc":true,"ai":{"summary":"An authenticated Backstage user can craft catalog entities with placeholder directives that reference resources outside the entity's source repository, potentially exposing unintended data to users who should not have access to it.","exploitability":"Exploitation requires an authenticated Backstage user with catalog entity creation privileges; the attack is relatively straightforward once the user has these permissions.","blast_radius":"The impact could be significant if the affected Backstage instance allows multiple teams or users to create catalog entities, potentially exposing sensitive data from other repositories or systems to unauthorized users.","remediation":"Upgrade to version 3.5.1, 3.6.2, 3.7.2, 3.8.2, or 3.9.1 of the @backstage/plugin-catalog-backend package.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["access-control","config-mgmt","developer-tools","data-exfiltration"],"model":"garnet-coder","analyzedAt":"2026-10-15T09:00:26.848Z"}}