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Critical · 10.0 Public exploit CVE-2026-1699 EUVD-2026-5040GHSA-r738-32mw-386p

In the Eclipse Theia Website repository, the GitHub Actions workflow .github/workflows/preview.yml used pull_request_target trigger while c…

Published Jan 30, 2026 · Updated Feb 2, 2026 · Assigned by eclipse

Vendor: Eclipse Foundation Product: Eclipse Theia - Website

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.

Affected products

VendorProductAffectedFixed
Eclipse Foundation Eclipse Theia - Website — —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • pvharmo2/gha-lab-b5c1313658 ★ 0 · Sep 4, 2026

    Authorized security-research lab reproducing CVE-2026-1699 (pwn request in preview.yml) — snapshot of eclipse-theia/theia-website

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

References