Medium 4.3Published Oct 6, 2026

CVE-2026-106497Backstage: Inconsistent catalog property permission evaluation

Updated under an hour ago (2026-10-19 08:20 UTC)

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It affects backstage and 3 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

Backstage is an open framework for building developer portals. Prior to 3.9.1, the @backstage/plugin-catalog-backend package is affected by inconsistent catalog property permission evaluation. In deployments that use affected value-based catalog permission conditions as a confidentiality boundary, an authenticated user could receive catalog entity data that policy authors intended to restrict. This issue is fixed in version 3.9.1.

CVSS: 4.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-178, 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)	before 1.54.6	CNA record
@backstage plugin-catalog-backend backstage:plugin_catalog_backend (from the name)	before 3.9.1	CNA record
linuxfoundation backstage_plugin-catalog-backend linuxfoundation:backstage_plugin-catalog-backend	before 3.9.1	NVD
linuxfoundation backstage linuxfoundation:backstage	before 1.54.6	NVD

References

https://github.com/backstage/backstage/security/advisories/GHSA-8429-xpcj-3cg5x-refsource-confirm, mitigation, vendor-advisory
https://github.com/backstage/backstage/commit/21424faa2e280a6bc6b9e5c5245952f16aafca7bx-refsource-misc, patch
https://github.com/backstage/backstage/releases/tag/v1.54.6x-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.