What’s Vulnerable › Vulnerabilities

CVE-2026-106496: Backstage: Inconsistent enforcement of allowed location types during catalog processing

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-06 · updated 2026-10-16
• Weakness: CWE-22

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 enforcement of allowed location types during catalog processing. Under certain configurations, the catalog backend could process location types that were not intended to be allowed, potentially leading to unintended file access on the backend host. This issue is fixed in version 3.9.1.

Affected products

• backstage: before 1.54.6 — fixed in 1.54.6
• Linuxfoundation Backstage Plugin-Catalog-Backend: before 3.9.1 — fixed in 3.9.1

How to fix

Upgrade to a fixed version: backstage 1.54.6; Linuxfoundation Backstage Plugin-Catalog-Backend 3.9.1. Check the vendor advisory for mitigations.

References

• https://github.com/backstage/backstage/commit/23774b61560d851bc69cd6a77d12561b24d11afd
• https://github.com/backstage/backstage/releases/tag/v1.54.6
• https://github.com/backstage/backstage/security/advisories/GHSA-pcmq-25r3-5w9v

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