CVE-2026-106498

Summary

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.

Affected Software

VendorProductVersion RangeStatus
backstagebackstage< 1.49.6affected
backstagebackstage>= 1.50.0-next.0, < 1.50.5affected
backstagebackstage>= 1.51.0-next.0, < 1.51.3affected
backstagebackstage>= 1.52.0-next.0, < 1.53.2affected
backstagebackstage>= 1.54.0-next.0, < 1.54.6affected
@backstageplugin-catalog-backend< 3.5.1affected
@backstageplugin-catalog-backend>= 3.6.0, < 3.6.2affected
@backstageplugin-catalog-backend>= 3.7.0, < 3.7.2affected
@backstageplugin-catalog-backend>= 3.8.0, < 3.8.2affected
@backstageplugin-catalog-backend>= 3.9.0, < 3.9.1affected

Weaknesses

  • CWE-863: CWE-863: Incorrect Authorization
  • CWE-918: CWE-918: Server-Side Request Forgery (SSRF)

References