Cross-site Request Forgery (CSRF) Affecting @theia/filesystem package, versions <1.74.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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 applicationsSnyk Learn
Learn about Cross-site Request Forgery (CSRF) vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-JS-THEIAFILESYSTEM-18565056
- published6 Aug 2026
- disclosed5 Aug 2026
- creditUnknown
Introduced: 5 Aug 2026
NewCVE-2026-60009 (opens in a new tab)How to fix?
Upgrade @theia/filesystem to version 1.74.0 or higher.
Overview
@theia/filesystem is a Theia - FileSystem Extension
Affected versions of this package are vulnerable to Cross-site Request Forgery (CSRF) through the NodeFileUploadService handler in the filesystem backend code. An attacker can overwrite any filesystem path the backend process can write by sending a multipart/form-data request to POST /file-upload with an attacker-controlled absolute uri target and an uploaded file, without a valid connection token. The upload handler accepts the uri field as the destination and moves the temporary upload there with no route-level authentication or workspace confinement. In browser deployments, a cross-origin page can trigger the request with no preflight, letting an unauthenticated attacker write outside the workspace and potentially achieve remote code execution by replacing a startup-executed file.