CVE-2026-106462: Backstage Plugin Scaffolder Credential Handling Vulnerability
Summary
CVE-2026-106462: Backstage's scaffolder credential handling may allow unintended GitHub authentication fallback. Affects @backstage/plugin-scaffolder-backend versions < 4.1.0. Fixed in 4.1.0. How to fix ↓
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Background
The Backstage Plugin Scaffolder is a tool designed to streamline the creation of software components by automating the setup process across various source control systems. It allows users to define templates for scaffolding new projects, integrating with platforms like GitHub, GitLab, and Bitbucket. However, this plugin has a vulnerability that may lead to unintended authentication fallbacks, potentially allowing unauthorized access to sensitive operations.
Vulnerability Detail
The vulnerability arises from the Scaffolder actions that interact with source control systems not consistently enforcing the intended credential boundaries under certain configurations. This inconsistency can allow an authenticated user to perform operations with broader access than intended, posing a risk to the integrity and security of the source control systems involved.
How To Fix
Latest published version: 4.2.1 as of 22 Oct 2026
npm install @backstage/plugin-scaffolder-backend@4.2.1Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
4.1.0
This is the first release that contains the fix.
npm install @backstage/plugin-scaffolder-backend@4.1.0Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If immediate upgrading is not possible, consider the following workarounds:
- Restrict who can create Scaffolder tasks and which templates they can execute.
- Limit SCM integration credentials to the minimum repository read and mutation permissions required.
- Remove integration credentials for SCM hosts where all required operations can use explicitly supplied user tokens.
Conclusion
In summary, CVE-2026-106462 presents a significant risk to users of the Backstage Plugin Scaffolder due to improper credential handling. It is crucial to upgrade to the patched versions of the affected packages and configure the plugin to enforce user-provided credentials to safeguard against unauthorized access.
See every vulnerability recorded for @backstage/plugin-scaffolder-backend →
FAQ
CVE-2026-106462 is a vulnerability in the Backstage Plugin Scaffolder that may allow unintended GitHub authentication fallback, potentially granting broader access than intended.
You can check if your application is affected by using the Vulert playground, which analyzes your package-lock.json file for vulnerabilities without requiring signup.
The risks include unauthorized access to source control operations, which could lead to data breaches or unauthorized changes to repositories.
The CVSS score of this vulnerability is 6.4, indicating a moderate severity level.
If you cannot upgrade immediately, implement the suggested workarounds to mitigate the risk until you can apply the patches.
References
Related vulnerabilities
Recent vulnerabilities recorded for @backstage/plugin-scaffolder-backend.
