Medium 6.5Published Oct 6, 2026

CVE-2026-106458Backstage: Inconsistent repository filtering in Bitbucket Server catalog event updates

Updated under an hour ago (Oct 27, 2026, 9:50 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for backstage

Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE): CWE-863
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Oct 7, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

backstage backstage backstage:backstage (from the name)	from 1.38.0, < 1.55.0	CNA record
@backstage plugin-catalog-backend-module-bitbucket-server backstage:plugin_catalog_backend_module_bitbucket_server (from the name)	from 0.4.0, < 0.5.15	CNA record
linuxfoundation backstage/plugin-catalog-backend-module-bitbucket-server linuxfoundation:backstage/plugin-catalog-backend-module-bitbucket-server	from 0.4.0 before 0.5.15	NVD
linuxfoundation backstage linuxfoundation:backstage	from 1.38.0 before 1.55.0	NVD

References

References

https://github.com/backstage/backstage/security/advisories/GHSA-c36c-cf6r-ghgj	x-refsource-confirm, mitigation, vendor-advisory
https://github.com/backstage/backstage/commit/989db63b6f87c8fc04d440f296ad89e10c79b363	x-refsource-misc, patch
https://github.com/backstage/backstage/releases/tag/v1.55.0	x-refsource-misc, patch, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.