CVE-2026-1699

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.

Exploit odds

0.6% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-01-30 10:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 10:16 UTC Last updatedMost recent change to the record

Details

Published

2026-01-30 10:15 UTC

Last modified

2026-06-17 10:16 UTC

Exploit probability

0.6% · EPSS, next 30 days

Weakness

CWE-829

Record status

Analyzed

Affected

• Eclipse Theia Website < 2026-01-22

Attack profile CVSS 3.1 · 10.0

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High