CVE-2026-1699 Code injection in Eclipse Theia - Website
Attackers can execute arbitrary code in CI via pull_request_target, exfiltrating secrets and modifying the website or packages.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-1699?
CVE-2026-1699 is a critical code injection vulnerability in Eclipse Theia - Website, published on 30 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-829
Which versions are affected by CVE-2026-1699?
It affects 1 product.
Products include Eclipse Theia Website.
How do I fix CVE-2026-1699?
No fix has been published for CVE-2026-1699 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-1699 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1699 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-r738-32mw-386p.