要点
- CVE-2026-106499 は backstage (linuxfoundation), backstage/plugin-scaffolder-backend (linuxfoundation), @backstage/plugin-scaffolder-backend に影響する深刻度「中」 (CVSS 4.9) の脆弱性です。
- 今後30日間に悪用される確率（EPSS）：0.27%（全脆弱性の 19.2% より高い）。
- 対処：1.54.6, 4.1.0 以降に更新してください。
概要
Impact
Deployments that configure sensitive scaffolder.defaultEnvironment.secrets and allow an attacker to create or modify Scaffolder templates are affected. A template author could cause secret-derived values used during template iteration to be persisted in task logs, exposing those values to users with access to the resulting task logs.
Patches
Patched in @backstage/plugin-scaffolder-backend version 4.1.0
Workarounds
- Restrict permission to create or update Template entities to fully trusted parties, as recommended by the Backstage threat model.
- If that restriction cannot be guaranteed, remove sensitive values from
scaffolder.defaultEnvironment.secrets until a patched version is available.
No complete workaround is known that preserves both untrusted template authoring and access to sensitive default-environment secrets.
NVD の説明
Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package could expose secret-derived values in Scaffolder task logs. Deployments that configure sensitive scaffolder.defaultEnvironment.secrets and allow an attacker to create or modify Scaffolder templates are affected. A template author could cause secret-derived values used during template iteration to be persisted and exposed to users who can access the resulting task logs. This issue is fixed in version 4.1.0.
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