Vulnerability · Published Jun 18, 2026 · Assigned by eclipse
CVE-2026-44688
High 8.4
In plain English
A high-severity security flaw in Eclipse Theia from Eclipse Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @theia/ai-chat | 1.71.0 | GHSA-3jww-hxqj-wfq2 |
| npm | @theia/ai-chat-ui | 1.71.0 | GHSA-3jww-hxqj-wfq2 |
| npm | @theia/ai-claude-code | 1.71.0 | GHSA-3jww-hxqj-wfq2 |
| npm | @theia/ai-code-completion | 1.71.0 | GHSA-3jww-hxqj-wfq2 |
| npm | @theia/ai-core | 1.71.0 | GHSA-3jww-hxqj-wfq2 |
| npm | @theia/ai-editor | 1.71.0 | GHSA-3jww-hxqj-wfq2 |
| npm | @theia/ai-ide | 1.71.0 | GHSA-3jww-hxqj-wfq2 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Eclipse Foundation | Eclipse Theia | 0 – before 1.71.0 |
Weakness: CWE-1427, CWE-829 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N