Description
In Eclipse Theia versions prior to 1.71.0, files matching the pattern .prompts/*.prompttemplate in a workspace were automatically loaded and could override or extend the AI agent's system prompts. An attacker could craft a malicious repository containing prompt template files that, when the workspace was opened in Theia, replaced the AI's system instructions with attacker-controlled content (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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Eclipse Foundation | Eclipse Theia | < 1.71.0 | 1.71.0 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | eclipse | No fix yet | — |
| Ubuntu 16.04 LTS | eclipse | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | @theia/ai-chat | < 1.71.0 | 1.71.0 | GHSA-m973-pr9r-hp2w |
| npm | @theia/ai-chat-ui | < 1.71.0 | 1.71.0 | GHSA-m973-pr9r-hp2w |
| npm | @theia/ai-claude-code | < 1.71.0 | 1.71.0 | GHSA-m973-pr9r-hp2w |
| npm | @theia/ai-code-completion | < 1.71.0 | 1.71.0 | GHSA-m973-pr9r-hp2w |
| npm | @theia/ai-core | < 1.71.0 | 1.71.0 | GHSA-m973-pr9r-hp2w |
| npm | @theia/ai-editor | < 1.71.0 | 1.71.0 | GHSA-m973-pr9r-hp2w |