CVE-2026-106501
criticalpriority · track · 0EPSS 0.005 · 41 %ileUSEPSS · scored 2026-10-27
Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder. An authenticated Backstage user who can read another user's Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.8–9.6
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (11)
Products and version ranges known to be affected.
- linuxfoundation backstage/plugin-scaffolder-backend< 3.3.1nvdUScpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend:*:*:*:*:*:*:*:*
- linuxfoundation backstage/plugin-scaffolder-backend3.4.0 → 3.4.1nvdUScpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend:*:*:*:*:*:*:*:*
- linuxfoundation backstage/plugin-scaffolder-backend4.0.0 → 4.0.3nvdUScpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend:*:*:*:*:*:*:*:*
- linuxfoundation backstage/plugin-scaffolder-backend4.0.4 → 4.1.0nvdUScpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend:*:*:*:*:*:*:*:*
- npm @backstage/plugin-scaffolder-backend3.4.0 → 3.4.1osvUSpkg:npm/%40backstage/plugin-scaffolder-backend
- npm @backstage/plugin-scaffolder-backend4.0.0 → 4.0.3osvUSpkg:npm/%40backstage/plugin-scaffolder-backend
- npm @backstage/plugin-scaffolder-backend4.0.4 → 4.1.0osvUSpkg:npm/%40backstage/plugin-scaffolder-backend
advisories (1)
Vendor and ecosystem advisories describing this.
- GHSA-g2v8-7jhw-pp8pBackstage: Sensitive information exposure in Scaffolder2026-10-07ghsa · osvUS
### Impact An authenticated Backstage user who can read another user's Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service. ### Patches Patched in `@backstage/plugin-scaffolder-backend` version `4.1.0` ### Workarounds - Configure `scaffolder.task.read` with the `isTaskOwner` condition so users can only read tasks they created. - Restrict affected integrations and workflows to trusted operators until an upgrade is available.
sources
Which sources assert this record, and when.
references (7) nvd
External citations — patches, advisories, analysis.
- https://github.com/backstage/backstage/commit/66d2219edf0abe33ab7d0c1ced5d069d1e065be5Patch
- https://github.com/backstage/backstage/commit/c19838870476a8e29144c84b1a5ac0654ec20fb5Patch
- https://github.com/backstage/backstage/commit/e262d649981ff99bb01ca7077807ae3e25e85560Patch
- https://github.com/backstage/backstage/releases/tag/v1.49.6PatchRelease Notes
- https://github.com/backstage/backstage/releases/tag/v1.50.5PatchRelease Notes
- https://github.com/backstage/backstage/releases/tag/v1.54.6PatchRelease Notes
- https://github.com/backstage/backstage/security/advisories/GHSA-g2v8-7jhw-pp8pMitigationVendor Advisory
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