VulnerabilityAnalyzed

CVE-2026-106497

Backstage is an open framework for building developer portals.

MEDIUM 4.3EPSS 0.19%

Does this matter?

Lower severity and a low EPSS score (0.19%). Track it; it rarely justifies an emergency change on its own.

Description

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 3.1: 4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
EPSS: 0.19% probability · 9th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-178, CWE-863
Affected: linuxfoundation/backstage plugin-catalog-backend · linuxfoundation/backstage
Source: security-advisories@github.com

EPSS trend

EPSS moved from 0.2% on 7 October 2026 to 0.2% on 26 October 2026.

References

https://github.com/backstage/backstage/commit/21424faa2e280a6bc6b9e5c5245952f16aafca7bPatch
https://github.com/backstage/backstage/releases/tag/v1.54.6Patch, Release Notes
https://github.com/backstage/backstage/security/advisories/GHSA-8429-xpcj-3cg5Mitigation, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.