Vulnerability Description
In the Eclipse Theia Website repository, the GitHub Actions workflow .github/workflows/preview.yml used pull_request_target trigger while checking out and executing untrusted pull request code. This allowed any GitHub user to execute arbitrary code in the repository's CI environment with access to repository secrets and a GITHUB_TOKEN with extensive write permissions (contents:write, packages:write, pages:write, actions:write). An attacker could exfiltrate secrets, publish malicious packages to the eclipse-theia organization, modify the official Theia website, and push malicious code to the repository.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Eclipse | Theia Website | < 2026-01-22 |
Related Weaknesses (CWE)
References
- https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/332ExploitIssue TrackingVendor Advisory
FAQ
What is CVE-2026-1699?
CVE-2026-1699 is a vulnerability with a CVSS score of 10.0 (CRITICAL). In the Eclipse Theia Website repository, the GitHub Actions workflow .github/workflows/preview.yml used pull_request_target trigger while checking out and executing untrusted pull request code. This a...
How severe is CVE-2026-1699?
CVE-2026-1699 has been rated CRITICAL with a CVSS base score of 10.0/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-1699?
Check the references section above for vendor advisories and patch information. Affected products include: Eclipse Theia Website.