CVE-2026-106498High· 7.7▾ TwilightBackstage 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. …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.4 · likelihood 0.1 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Oct 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.3%
Last analysed / modified upstream
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.
backstage_plugin-catalog-backend < 3.5.1backstage_plugin-catalog-backend >= 3.6.0, < 3.6.2backstage_plugin-catalog-backend >= 3.7.0, < 3.7.2backstage_plugin-catalog-backend >= 3.8.0, < 3.8.2backstage_plugin-catalog-backend >= 3.9.0, < 3.9.1backstage < 1.49.6backstage >= 1.50.0, < 1.50.5backstage >= 1.51.0, < 1.51.3backstage >= 1.52.0, < 1.53.2backstage >= 1.54.0, < 1.54.6Upgrade past the affected range:
backstage_plugin-catalog-backend 3.9.1backstage 1.54.6Affected packages:
@backstage/plugin-catalog-backend < 3.9.1Patched in:
@backstage/plugin-catalog-backend 3.9.1Source: https://github.com/advisories/GHSA-qgvj-qcf8-xq73
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-106503High· 8.1Backstage is an open framework for building developer portals
CVE-2026-106501Critical· 9.6Backstage is an open framework for building developer portals
CVE-2026-106500High· 8.5Backstage is an open framework for building developer portals
CVE-2026-106496Low· 3.1Backstage is an open framework for building developer portals
CVE-2026-106509High· 7.7Backstage is an open framework for building developer portals
CVE-2026-106505High· 7.7Backstage is an open framework for building developer portals