[Eclipse Theia] Arbitrary Command Execution via Untrusted Workspace Task Definitions
In Eclipse Theia versions prior to 1.69.0, custom task definitions in workspace files (e.g. .theia/tasks.json, .vscode/tasks.json) could be executed without requiring workspace trust. An attacker could craft a malicious repository that, when cloned and opened in Theia, leads to execution of arbitrary commands with the user's privileges. In combination with AI chat features and a workspace .theia/settings.json that disabled tool confirmation, this could be triggered automatically by sending a message in the AI chat.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @theia/debug | < 1.69.0 | 1.69.0 |
| npm package | @theia/task | < 1.69.0 | 1.69.0 |
| npm package | @theia/workspace | < 1.69.0 | 1.69.0 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-44691
- https://github.com/eclipse-theia/theia/issues/16889
- https://github.com/eclipse-theia/theia/pull/16917
- https://github.com/eclipse-theia/theia
- https://gitlab.eclipse.org/security/cve-assignment/-/work_items/116
- https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/331
- CVSS vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-829- Platform
- npm
- Package
@theia/debug, @theia/task, @theia/workspace- Disclosed
- 18.06.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-g9jw-92q7-g7fj - CC BY 4.0
Vulnerability history: @theia/debug
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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