What is CVE-2026-44691?

CVE-2026-44691 is a high-severity vulnerability in Eclipse Theia, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 8.8/10. Published 2026-06-18.

How severe is CVE-2026-44691?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Eclipse Theia

CVE-2026-44691

In Eclipse Theia versions prior to 1.69.0, custom task definitions in workspace files (e.g. .theia/tasks.json, .vscode/tasks.json) could be executed without requiring workspace trust. An attacker could craft a malicious repository that, when cloned and opened in Theia, leads to execution of arbitrary commands with the user's privileges. In combination with AI chat features and a workspace .theia/settings.json that disabled tool confirmation, this could be triggered automatically by sending a message in the AI chat.

Published 2026-06-18 · last modified 2026-10-26.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (35.2th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Eclipse Theia
Eclipse Foundation Theia — versions 0

Weakness classification (CWE)

CWE-829 — Inclusion of Functionality from Untrusted Control Sphere

References

gitlab.eclipse.org/security/cve-assignment/-/work_items/116 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-44691?: CVE-2026-44691 is a high-severity vulnerability in Eclipse Theia, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 8.8/10. Published 2026-06-18.
How severe is CVE-2026-44691?: High severity. CVSS v3 base score is 8.8 out of 10.