Vulnerability in Eclipse Theia
CVE-2026-44688
In Eclipse Theia versions prior to 1.71.0, the AI chat agent processed workspace file and directory names as part of its prompt context without distinguishing them from system instructions. An attacker could craft a malicious repository with adversarial directory or file names that, when analyzed by the AI agent, would cause the agent to follow attacker-controlled instructions (indirect prompt injection). Combined with other AI chat features available in untrusted workspaces, this enabled attack chains leading to data exfiltration via Markdown image rendering or arbitrary command execution via task definitions.
EPSS: 0.005 (42.2th percentile) — read the EPSS interpretation.
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.
Affected products
- Eclipse Theia
- Eclipse Foundation Theia — versions 0
Weakness classification (CWE)
References
- emo@eclipse.org (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-44688?
- CVE-2026-44688 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-2026-44688?
- High severity. CVSS v3 base score is 8.8 out of 10.