Missing Origin Validation in WebSockets Affecting @theia/core package, versions <1.73.0
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-THEIACORE-17810710
- published3 Jul 2026
- disclosed3 Jul 2026
- creditAnwarAyoob
Introduced: 3 Jul 2026
NewCVE-2026-10054 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade @theia/core to version 1.73.0 or higher.
Overview
@theia/core is a the main extension for all Theia-based applications, and provides the main framework for all dependent extensions.
Affected versions of this package are vulnerable to Missing Origin Validation in WebSockets via the shell-terminal and terminals/:id WebSocket endpoints when origin validation is bypassed due to missing or manipulated headers. An attacker can execute arbitrary operating system commands and access their output by enticing a user to visit a malicious web page while a vulnerable instance is running.