Inconsistent Repository Filtering Vulnerability in Backstage Plugin by Spotify
CVE-2026-106458

6.5MEDIUM

Key Information:

Vendor

Backstage

Status
Backstage
Plugin-catalog-backend-module-bitbucket-server
Vendor
CVE Published:
6 October 2026

What is CVE-2026-106458?

The Backstage framework, specifically the @backstage/plugin-catalog-backend-module-bitbucket-server package, encountered an inconsistency in repository filtering. This issue affects versions from 0.4.0 to 0.5.15, allowing authenticated users to unintentionally trigger repository events even for repositories that should be filtered out based on project and repository settings. As a result, catalog locations could be ingested despite being excluded by the configured filters. To mitigate this vulnerability, users are encouraged to update to version 0.5.15 or later.

Affected Version(s)

backstage >= 1.38.0, < 1.55.0

plugin-catalog-backend-module-bitbucket-server >= 0.4.0, < 0.5.15

References

https://github.com/backstage/backstage/security/advisorie...
x_refsource_CONFIRM
https://github.com/backstage/backstage/commit/989db63b6f8...
x_refsource_MISC
https://github.com/backstage/backstage/releases/tag/v1.55.0
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CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.