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CVE-2026-106458

6.5 · MEDIUM

Backstage is an open framework for building developer portals.

Published Oct 6, 2026linuxfoundationCWE-863EPSS 0.27%

Overview

CVE-2026-106458 is a medium-severity vulnerability affecting linuxfoundation backstage\/plugin-catalog-backend-module-bitbucket-server. It was published on October 6, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

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

Check the references section for vendor advisories and patches from linuxfoundation. Update backstage\/plugin-catalog-backend-module-bitbucket-server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
linuxfoundationbackstage\/plugin-catalog-backend-module-bitbucket-server>= 0.4.0, < 0.5.15Affected
linuxfoundationbackstage>= 1.38.0, < 1.55.0Affected

References

GitHubgithub.com/backstage/backstage/commit/989db63b6f87c8fc04d440f296ad89e10c79b363GitHubgithub.com/backstage/backstage/releases/tag/v1.55.0GitHubgithub.com/backstage/backstage/security/advisories/GHSA-c36c-cf6r-ghgj

How CyberStrike helps

Frequently asked questions

What is CVE-2026-106458?

CVE-2026-106458 is a medium-severity vulnerability affecting linuxfoundation backstage\/plugin-catalog-backend-module-bitbucket-server. It was published on October 6, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-106458?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-106458?

Check the references section for vendor advisories and patches from linuxfoundation. Update backstage\/plugin-catalog-backend-module-bitbucket-server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-106458?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-106458 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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