---
id: CVE-2026-106458
title: Backstage is an open framework for building developer portals
summary: >-
  Backstage is an open framework for building developer portals. From 0.4.0
  until 0.5.15, the @backstage/plugin-catalog-backend-module-bitbucket-server
  package is affected by inconsistent repository filtering in bitbucket server
  catalog ev…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-863
vendor: backstage
product: backstage
affected:
  - 'backstage >= 1.38.0, < 1.55.0'
  - 'plugin-catalog-backend-module-bitbucket-server >= 0.4.0, < 0.5.15'
published: '2026-10-06'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T21:17:16.270'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106458'
references:
  - url: >-
      https://github.com/backstage/backstage/commit/989db63b6f87c8fc04d440f296ad89e10c79b363
    label: security-advisories@github.com
  - url: 'https://github.com/backstage/backstage/releases/tag/v1.55.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/backstage/backstage/security/advisories/GHSA-c36c-cf6r-ghgj
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-06T21:20:28.981Z'
---

## Overview

Backstage is an open framework for building developer portals. From 0.4.0 until 0.5.15, the @backstage/plugin-catalog-backend-module-bitbucket-server package is affected by inconsistent repository filtering in bitbucket server catalog event updates. Deployments using event-driven updates in the Bitbucket Server catalog provider may ingest catalog locations from repositories that are excluded by the provider's configured project, repository, or archived-repository filters. An authenticated Bitbucket Server user who can push to a filtered-out repository that remains readable by the configured Backstage integration can trigger a legitimate repository event. The affected event path may then add a Location for that repository even though scheduled discovery excludes it. This issue is fixed in version 0.5.15.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.