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CVE-2026-1699

Eclipse Theia Website remote code execution

10.0 CRITICALPublic exploitEPSS 0.56%
  1. Published30 Jan 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Eclipse Theia Website< 2026-01-22

Remediation

Fixed in
Eclipse Theia Website≥ 2026-01-22

References

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Frequently asked

Is CVE-2026-1699 being actively exploited?

CVE-2026-1699 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.56%.

How severe is CVE-2026-1699?

CVE-2026-1699 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 0.56% probability of exploitation.

Which products are affected by CVE-2026-1699?

Affected products include Eclipse Theia Website.

How do I fix CVE-2026-1699?

Upgrade affected software to a fixed version, for example Eclipse Theia Website 2026-01-22 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-1699 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.