CVE-2026-106501
Critical
Description
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.
SeverityCritical
CVSS9.6
Exploit probability—
Product
Linuxfoundation Backstage
PublishedOct 6, 2026
First seenOct 6, 2026
Weakness typeCWE-200Sensitive information exposureCWE-201CWE-201
How to fix
Update
- linuxfoundation backstage1.49.6, 1.50.5, 1.54.6 or later
- linuxfoundation backstage\/plugin-scaffolder-backend3.3.1, 3.4.1, 4.0.3, 4.1.0 or later
- @backstage/plugin-scaffolder-backend3.3.1, 3.4.1, 4.0.3, 4.1.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linuxfoundation backstage | v < 1.49.6, 1.50.0 ≤ v < 1.50.5, 1.51.0 ≤ v < 1.54.6 | 1.49.6, 1.50.5, 1.54.6 |
| linuxfoundation backstage\/plugin-scaffolder-backend | v < 3.3.1, 3.4.0 ≤ v < 3.4.1, 4.0.0 ≤ v < 4.0.3, 4.0.4 ≤ v < 4.1.0 | 3.3.1, 3.4.1, 4.0.3, 4.1.0 |
| @backstage/plugin-scaffolder-backendnpm | v < 3.3.1, 3.4.0 ≤ v < 3.4.1, 4.0.0 ≤ v < 4.0.3, 4.0.4 ≤ v < 4.1.0 | 3.3.1, 3.4.1, 4.0.3, 4.1.0 |
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