Backstage has incorrect authorization in search engine permission filtering

MITTEL 4.3CVE-2026-106562 · GHSA-9325-vq29-gp3v · Published 07/10/2026 · updated 16/10/2026

Package	Affected versions	Patched versions
backstage linuxfoundation	`< 1.54.1`	`1.54.1`
backstage/plugin-search-backend linuxfoundation	`< 2.1.6`	`2.1.6`
backstage/plugin-search-backend-module-elasticsearch linuxfoundation	`< 1.8.7`	`1.8.7`
@backstage/plugin-search-backend npm	`< 2.1.6`	`2.1.6`
@backstage/plugin-search-backend-module-elasticsearch npm	`< 1.8.7`	`1.8.7`

Description

Impact

An authenticated Backstage user subject to a DENY policy for search document types could receive search results they were not authorized to view. This affects deployments with permission.enabled: true and an Elasticsearch or OpenSearch search backend.

Patches

Upgrade @backstage/plugin-search-backend to 2.1.6
Upgrade @backstage/plugin-search-backend-module-elasticsearch to 1.8.7

Workarounds

If you are unable to upgrade immediately:

Temporarily modify permission policies to use CONDITIONAL decisions with per-result filtering rather than blanket DENY for search document types
Restrict Elasticsearch/OpenSearch index access at the cluster level so that the search service account can only reach expected Backstage indices, limiting the blast radius if the authorization bypass is triggered.

NVD 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.

References

backstage/backstage security advisory · WEB
nvd.nist.gov/vuln/detail/CVE-2026-106562 · ADVISORY
backstage/backstage commit 2d5d3e7 · WEB
backstage/backstage · PACKAGE
backstage/backstage release v1.54.1 · WEB

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Package

Affected versions

Patched versions

backstage

linuxfoundation

< 1.54.1

1.54.1

backstage/plugin-search-backend

linuxfoundation

< 2.1.6

2.1.6

backstage/plugin-search-backend-module-elasticsearch

linuxfoundation

< 1.8.7

1.8.7

@backstage/plugin-search-backend

npm

< 2.1.6

2.1.6

@backstage/plugin-search-backend-module-elasticsearch

npm

< 1.8.7

1.8.7

Description

Impact

Patches

Upgrade @backstage/plugin-search-backend to 2.1.6
Upgrade @backstage/plugin-search-backend-module-elasticsearch to 1.8.7

Workarounds

If you are unable to upgrade immediately:

Temporarily modify permission policies to use CONDITIONAL decisions with per-result filtering rather than blanket DENY for search document types
Restrict Elasticsearch/OpenSearch index access at the cluster level so that the search service account can only reach expected Backstage indices, limiting the blast radius if the authorization bypass is triggered.

NVD description