CVE-2026-44374: Backstage: Catalog unprocessed read endpoints allow authenticated cross-owner data access without permission checks

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-14 · updated 2026-10-26
Weakness: CWE-863

Description

Backstage is an open framework for building developer portals. Prior to 0.6.11, the unprocessed entities read endpoints in @backstage/plugin-catalog-backend-module-unprocessed do not enforce permission authorization checks. Any authenticated user can access unprocessed entity records regardless of ownership. This is an information disclosure vulnerability affecting Backstage installations using this module. This is patched in @backstage/plugin-catalog-backend-module-unprocessed version 0.6.11, @backstage/plugin-catalog-unprocessed-entities-common version 0.0.15 and @backstage/plugin-catalog-unprocessed-entities version 0.2.30.

Affected products

Linuxfoundation Backstage/Plugin-Catalog-Backend-Module-Unprocessed: before 0.6.11 — fixed in 0.6.11
Linuxfoundation Backstage/Plugin-Catalog-Unprocessed-Entities: before 0.2.30 — fixed in 0.2.30
Linuxfoundation Backstage/Plugin-Catalog-Unprocessed-Entities-Common: before 0.0.15 — fixed in 0.0.15

How to fix

Upgrade to a fixed version: Linuxfoundation Backstage/Plugin-Catalog-Backend-Module-Unprocessed 0.6.11; Linuxfoundation Backstage/Plugin-Catalog-Unprocessed-Entities 0.2.30; Linuxfoundation Backstage/Plugin-Catalog-Unprocessed-Entities-Common 0.0.15. Check the vendor advisory for mitigations.

References

https://github.com/backstage/backstage/security/advisories/GHSA-p7g9-rp3g-mgfg

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