CVE-2026-19884
HighCVSS 8.4Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In Eclipse Theia up to version 1.69.0, opening a folder starts source control integration without first asking the user to trust the folder. Applications built on Theia that include git integration execute git commands (e.g., git status) as soon as a repository is detected. Because git honors repository-local configuration, a folder with an attacker-controlled .git/config containing core.fsmonitor can cause the configured command to be executed. Cloning an attacker-supplied repository and opening it in a Theia-based application is sufficient to execute arbitrary commands with user privileges, without any confirmation prompt.
Risk Assessment
An attacker can remotely execute arbitrary code on the victim's machine if the victim clones and opens a malicious repository in a Theia application. This could lead to full system compromise, data theft, or further network propagation.
Recommendation
Upgrade Eclipse Theia to version 1.70.0 or later immediately, which fixes the vulnerability. If upgrading is not possible, avoid opening untrusted repositories in Theia-based applications.
Original NVD description (English source)
In Eclipse Theia versions up to and including 1.69.0, opening a folder starts source control integration without requiring the user to trust the folder first. This affects applications built on Theia that include the git integration, such as the Theia IDE. Both Theia's own `@theia/git` extension and the builtin VS Code `git` extension run git commands such as `git status` as soon as a repository is detected. Since git honors repository-local configuration, a folder containing an attacker-controlled `.git/config` with `core.fsmonitor` (or a comparable hook-like setting) causes the configured command to be executed. The configuration can be delivered by burying a bare repository inside a regular repository (OVE-20210718-0001), so cloning an attacker-supplied repository and opening it in a Theia-based application is sufficient to execute arbitrary commands with the privileges of the user, without any confirmation prompt. As of 1.70.0, plugins that declare `capabilities.untrustedWorkspaces.supported: false`, which includes the builtin git extension, are no longer loaded or activated in an untrusted workspace, and the deprecated `@theia/git` extension has been removed, so no git command is executed against an untrusted folder.