要点
- CVE-2026-106489 は backstage (linuxfoundation), backstage/plugin-techdocs-backend (linuxfoundation), @backstage/plugin-techdocs-backend に影響する深刻度「中」 (CVSS 6.5) の脆弱性です。
- 今後30日間に悪用される確率（EPSS）：0.29%（全脆弱性の 21.5% より高い）。
- 対処：1.54.6, 2.2.4 以降に更新してください。
概要
Impact
An authenticated user with access to one TechDocs documentation site could craft a URL able to read documentation belonging to a different entity. This only affects deployments using the external TechDocs builder with an external storage provider (S3, GCS, etc.) and the permission framework enabled. Instances that do not use the permission framework are unaffected, since TechDocs content is visible to all authenticated users by design.
Patches
Patched in @backstage/plugin-techdocs-backend version 2.2.4
Workarounds
- None other than upgrading. Deployments that serve TechDocs from local storage are not affected.
NVD の説明
Backstage is an open framework for building developer portals. Prior to 2.2.4, the @backstage/plugin-techdocs-backend package is affected by improper authorization enforcement for techdocs static content. An authenticated user with access to one TechDocs documentation site could craft a URL able to read documentation belonging to a different entity. This only affects deployments using the external TechDocs builder with an external storage provider (S3, GCS, etc.) and the permission framework enabled. Instances that do not use the permission framework are unaffected, since TechDocs content is visible to all authenticated users by design. This issue is fixed in version 2.2.4.
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