Vulnerabilities in pkg:npm/@backstage/plugin-catalog-backend-module-unprocessed

PACKAGE
Advisory Identifier: GHSA-p7g9-rp3g-mgfg
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Advisory Summary

CVE-2026-44374 is a MODERATE (CVSS 4.3) catalog unprocessed read endpoints allow vulnerability (CWE-863: Incorrect Authorization) affecting Backstage libraries in the npm ecosystem. The issue involves catalog unprocessed read endpoints allow authenticated cross-owner data access without permission checks. Remediation is available by upgrading affected packages to version 0.0.15, 0.2.30, 0.6.11.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:npm/@backstage/plugin-catalog-backend-module-unprocessed

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:npm/@backstage/plugin-catalog-backend-module-unprocessed. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-p7g9-rp3g-mgfg CVE-2026-44374 MODERATE Backstage: Catalog unprocessed read endpoints allow authenticated cross-owner data access without permission checks

CVE-2026-44374 at a Glance

CVE Identifier CVE-2026-44374
GHSA Identifier GHSA-p7g9-rp3g-mgfg
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-863: Incorrect Authorization
Affected Product Backstage
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 4.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-44374

To remediate this vulnerability, upgrade all affected Backstage dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

@backstage/plugin-catalog-unprocessed-entities-common fixed: 0.0.15 
npm install @backstage/plugin-catalog-unprocessed-entities-common@0.0.15
@backstage/plugin-catalog-unprocessed-entities fixed: 0.2.30 
npm install @backstage/plugin-catalog-unprocessed-entities@0.2.30
@backstage/plugin-catalog-backend-module-unprocessed fixed: 0.6.11 
npm install @backstage/plugin-catalog-backend-module-unprocessed@0.6.11
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls @backstage/plugin-catalog-unprocessed-entities-common

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-44374, inspect your project dependencies using npm:

npm ls @backstage/plugin-catalog-unprocessed-entities-common

Analyze the terminal output to locate any version of Backstage in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.0.15), your application is affected.

Note: The npm ls @backstage/plugin-catalog-unprocessed-entities-common command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. In Backstage, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact 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. ### Patches 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. Users should upgrade all packages. ### Workarounds If users cannot upgrade, they can remove the `@backstage/plugin-catalog-backend-module-unprocessed` module from their backend until the patch is applied. There is no configuration-based workaround to add permission checks to these endpoints without upgrading.

CVE-2026-44374 Affected Backstage Versions

3 component(s)
Fixed Versions:
0.0.150.2.300.6.11
Product / Package Ecosystem Affected Versions Fixed Version
@backstage/plugin-catalog-unprocessed-entities-common
npm/@backstage/plugin-catalog-unprocessed-entities-common
npm
< 0.0.15
0.0.15
@backstage/plugin-catalog-unprocessed-entities
npm/@backstage/plugin-catalog-unprocessed-entities
npm
< 0.2.30
0.2.30
@backstage/plugin-catalog-backend-module-unprocessed
npm/@backstage/plugin-catalog-backend-module-unprocessed
npm
< 0.6.11
0.6.11

References

GitHub Advisory / Wiki ADVISORY
https://github.com/backstage/backstage/security/advisories/GHSA-p7g9-rp3g-mgfg
NVD — CVE-2026-44374 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44374
Backstage Source Repository REPOSITORY
https://github.com/backstage/backstage

Frequently Asked Questions

What is CVE-2026-44374?
CVE-2026-44374 is a security vulnerability in Backstage involving Catalog unprocessed read endpoints allow authenticated cross-owner data access without permission checks under CWE-863: Incorrect Authorization.
Which Backstage versions are affected?
Affected versions include releases prior to 0.0.15, 0.2.30, 0.6.11 across affected packages: @backstage/plugin-catalog-unprocessed-entities-common, @backstage/plugin-catalog-unprocessed-entities, @backstage/plugin-catalog-backend-module-unprocessed.
What version fixes CVE-2026-44374?
Upgrading to 0.0.15, 0.2.30, 0.6.11 (or the latest patched release for your respective branch) resolves the vulnerability.
Is @backstage/plugin-catalog-unprocessed-entities-common affected?
Yes, @backstage/plugin-catalog-unprocessed-entities-common is affected in releases prior to 0.0.15. Upgrade your dependency to 0.0.15 or later.
Is @backstage/plugin-catalog-unprocessed-entities affected?
Yes, @backstage/plugin-catalog-unprocessed-entities is affected in releases prior to 0.2.30. Upgrade your dependency to 0.2.30 or later.
What is the CVSS score of CVE-2026-44374?
CVE-2026-44374 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-44374?
CVE-2026-44374 is classified under CWE-863: Incorrect Authorization (The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.).
How can I check npm dependencies for CVE-2026-44374?
Run the dependency tree command: 'npm ls @backstage/plugin-catalog-unprocessed-entities-common'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-p7g9-rp3g-mgfg",
  "modified" : "2026-05-14T20:49:31Z",
  "published" : "2026-05-06T23:04:07Z",
  "aliases" : [ "CVE-2026-44374" ],
  "summary" : "Backstage: Catalog unprocessed read endpoints allow authenticated cross-owner data access without permission checks",
  "details" : "### Impact   \n\n  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 \n  an information disclosure vulnerability affecting Backstage installations using this module.                                                                     \n                                                                        \n  ### Patches             \n                                         \n  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. Users should upgrade all packages.                                    \n   \n  ### Workarounds                                                                                                                                                                                                                                  \n                                                                        \n  If users cannot upgrade, they can remove the `@backstage/plugin-catalog-backend-module-unprocessed` module from their backend until the patch is applied. There is no configuration-based workaround to add permission checks to these endpoints    \n  without upgrading.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@backstage/plugin-catalog-unprocessed-entities-common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.0.15"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@backstage/plugin-catalog-unprocessed-entities"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.2.30"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@backstage/plugin-catalog-backend-module-unprocessed"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.6.11"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/backstage/backstage/security/advisories/GHSA-p7g9-rp3g-mgfg"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-44374"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/backstage/backstage"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-06T23:04:07Z",
    "nvd_published_at" : "2026-05-14T15:16:48Z"
  }
}