What’s Vulnerable › Vulnerabilities

CVE-2026-106562: Backstage: Incorrect authorization in search engine permission filtering

• Severity: medium (CVSS 4.3 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: 2026-10-07 · updated 2026-10-16
• Weakness: CWE-754

Description

Backstage is an open framework for building developer portals. Prior to 2.1.6 in @backstage/plugin-search-backend and 1.8.7 in @backstage/plugin-search-backend-module-elasticsearch, search engine permission filtering could return documents denied by policy. An authenticated Backstage user subject to a DENY policy for search document types could receive unauthorized results in deployments with permission.enabled set to true and an Elasticsearch or OpenSearch backend. This issue is fixed in @backstage/plugin-search-backend 2.1.6 and @backstage/plugin-search-backend-module-elasticsearch 1.8.7.

Affected products

• backstage: before 1.54.1 — fixed in 1.54.1
• Linuxfoundation Backstage/Plugin-Search-Backend: before 2.1.6 — fixed in 2.1.6
• Linuxfoundation Backstage/Plugin-Search-Backend-Module-Elasticsearch: before 1.8.7 — fixed in 1.8.7

How to fix

Upgrade to a fixed version: backstage 1.54.1; Linuxfoundation Backstage/Plugin-Search-Backend 2.1.6; Linuxfoundation Backstage/Plugin-Search-Backend-Module-Elasticsearch 1.8.7. Check the vendor advisory for mitigations.

References

• https://github.com/backstage/backstage/commit/2d5d3e77d630455d6d48cfa8f31fd3c126fd6f29
• https://github.com/backstage/backstage/releases/tag/v1.54.1
• https://github.com/backstage/backstage/security/advisories/GHSA-9325-vq29-gp3v

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