Plugin scaffolder backend: Backstage: Sensitive information exposure in Scaffolder (CVE-2026-106501)
Description
CVE-2026-106501 is a critical vulnerability in the @backstage/plugin-scaffolder-backend that allows an authenticated user to read another user's Scaffolder task and potentially access sensitive internal execution data. This data may include credentials for external services, leading to unauthorized disclosure and changes in those services. The issue affects multiple versions prior to 4.1.0 and has been patched in version 4.1.0. Mitigations include restricting task read permissions to task owners and limiting affected workflows to trusted operators until patched.
CVSS v3.1
Score 9.6critical
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
An authenticated user in Backstage with permission to read Scaffolder tasks can access internal execution data from other users' tasks. If this data contains credentials for external services, it may lead to unauthorized disclosure and unauthorized modifications in those external services. The vulnerability is fixed in @backstage/plugin-scaffolder-backend version 4.1.0. Workarounds include configuring the scaffolder.task.read permission with the isTaskOwner condition and restricting affected integrations and workflows to trusted operators.
Potential Impact
The vulnerability allows unauthorized disclosure of sensitive internal execution data, including credentials for external services, to authenticated users who should not have access. This can result in unauthorized changes to external services, posing a critical confidentiality and integrity risk. There is no indication of availability impact or known exploits in the wild at this time.
Mitigation Recommendations
A patch is available in @backstage/plugin-scaffolder-backend version 4.1.0 and should be applied promptly. Until the patch can be applied, configure the scaffolder.task.read permission with the isTaskOwner condition to restrict task reading to the task creator. Additionally, restrict affected integrations and workflows to trusted operators to minimize risk.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-g2v8-7jhw-pp8p
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-106501"]
- Ecosystems
- ["npm"]
- Database Specific Severity
- CRITICAL
- Cvss Version
- 3.1
Threat ID: 6ac6c0012cdf04f6568291bc
Added to database: 10/07/2026, 21:56:17 UTC
Last enriched: 10/07/2026, 22:15:28 UTC
Last updated: 10/07/2026, 22:15:28 UTC
Views: 2
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