Symlink Attack Affecting @backstage/plugin-scaffolder-backend-module-bitbucket-cloud package, versions <0.3.10
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-JS-BACKSTAGEPLUGINSCAFFOLDERBACKENDMODULEBITBUCKETCLOUD-20825502
- published11 Oct 2026
- disclosed7 Oct 2026
- creditUnknown
Introduced: 7 Oct 2026
NewCVE-2026-106486 (opens in a new tab)How to fix?
Upgrade @backstage/plugin-scaffolder-backend-module-bitbucket-cloud to version 0.3.10 or higher.
Overview
@backstage/plugin-scaffolder-backend-module-bitbucket-cloud is a The Bitbucket Cloud module for @backstage/plugin-scaffolder-backend
Affected versions of this package are vulnerable to Symlink Attack via the pull request workspace copy logic in bitbucketServerPullRequest.ts (and the corresponding Bitbucket Cloud action), where fs.cpSync is used with the recursive: true option to copy source files into a temporary directory. Node's native fs.cpSync follows symbolic links when copying recursively, allowing an attacker who controls the source repository contents to include symlinks that escape the intended workspace boundary and read or overwrite arbitrary files on the server.