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    CVE-2026-1699

    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.

    Published:Jan 30, 2026
    Last Modified:Apr 18, 2026
    EPS:Jan 30, 2026
    EPSS Score:0.00039
    CVSS Score:10

    Affected Products

    Vendor
    Eclipse
    Product
    Theia
    Vendor
    Eclipse
    Product
    Theia Website

    Exploits

    https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/332https://github.com/pvharmo2/gha-lab-b5c1313658

    Related CVEs

    CVE-2026-19884 (CVSS 8.4) — In Eclipse Theia versions up to and including 1.69.0, opening a folder starts source control integration witho…
    CVE-2026-61891 (CVSS 7.5) — In Eclipse Theia versions up to and including 1.73.1, the `@theia/filesystem` backend exposes HTTP file-downlo…
    CVE-2026-60009 (CVSS 8.8) — In Eclipse Theia versions up to and including 1.73.1, the `@theia/filesystem` backend binds `POST /file-upload…
    CVE-2026-14574 (CVSS 5.7) — In Eclipse Theia versions 0.7.0 and up until including 1.73.1, the `PreferenceUtils.merge` function in `@theia…
    CVE-2026-10055 (CVSS 8.5) — In Eclipse Theia since version 1.26.0, the backend /services/request-service RPC accepts an attacker-controlle…
    CVE-2026-10054 (CVSS 8.8) — In affected versions of Eclipse Theia (1.8.1 and later), the browser backend exposes privileged terminal RPC o…
    CVE-2026-44691 (CVSS 8.4) — In Eclipse Theia versions prior to 1.69.0, custom task definitions in workspace files (e.g. .theia/tasks.json,…
    CVE-2026-22551 (CVSS 6.7) — In Eclipse Theia versions prior to 1.71.0, the AI chat rendered Markdown image tags from AI responses, trigger…
    CVE-2026-46580 (CVSS 8.4) — In Eclipse Theia versions prior to 1.71.0, files matching the pattern .prompts/*.prompttemplate in a workspace…
    CVE-2026-44688 (CVSS 8.4) — In Eclipse Theia versions prior to 1.71.0, the AI chat agent processed workspace file and directory names as p…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-1699 — Eclipse (Critical 10) | CVE-DB