CVE-2026-1699
CVE-2026-1699 is a critical-severity vulnerability in Eclipse Theia Website with a CVSS 3.x base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-829.
Key facts
- Severity: Critical (CVSS 3.x base score 10.0)
- EPSS exploit prediction: 1% (39th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-5040
- Weakness: CWE-829
- Affected product: Eclipse Theia Website
- Published:
- Last modified:
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2026-1699?
- CVE-2026-1699 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-1699 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-1699?
- CVE-2026-1699 affects Eclipse Theia Website. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-1699?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2026-1699 have an EU (EUVD) identifier?
- Yes. CVE-2026-1699 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5040.
- When was CVE-2026-1699 published?
- CVE-2026-1699 was published on 2026-01-30 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:eclipse:theia_website:*:*:*:*:*:*:*:*
Other CWE-829 vulnerabilities
- CVE-2025-70974 — Critical (CVSS 10.0): Fastjson before 1.2.48 mishandles autoType because, when an @type key is in a JSON document, and the value of that key…
- CVE-2025-0982 — Critical (CVSS 10.0): Sandbox escape in the JavaScript Task feature of Google Cloud Application Integration allows an actor to execute…
- CVE-2021-41037 — Critical (CVSS 10.0): In Eclipse p2, installable units are able to alter the Eclipse Platform installation and the local machine via…
- CVE-2022-1161 — Critical (CVSS 10.0): An attacker with the ability to modify a user program may change user program code on some ControlLogix, CompactLogix,…
- CVE-2020-4561 — Critical (CVSS 10.0): IBM Cognos Analytics 11.0 and 11.1 DQM API allows submitting of all control requests in unauthenticated sessions. This…
- CVE-2026-27941 — Critical (CVSS 9.9): OpenLIT is an open source platform for AI engineering. Prior to version 1.37.1, several GitHub Actions workflows in…