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GHSA-qwjm-9c66-w4q4

[Eclipse Theia] Data Exfiltration via Markdown Image Rendering in AI Chat

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-22551

Packages

EcosystemPackageAffectedFixed in
npm @theia/ai-chat-ui < 1.71.0 1.71.0
npm @theia/ai-chat < 1.71.0 1.71.0
npm @theia/ai-claude-code < 1.71.0 1.71.0
npm @theia/ai-code-completion < 1.71.0 1.71.0
npm @theia/ai-core < 1.71.0 1.71.0
npm @theia/ai-editor < 1.71.0 1.71.0
npm @theia/ai-ide < 1.71.0 1.71.0

Details

As written in the advisory (Markdown source, shown as plain text).

In Eclipse Theia versions prior to 1.71.0, the AI chat rendered Markdown image tags from AI responses, triggering HTTP requests to arbitrary external URLs without restriction. Combined with prompt injection in a malicious workspace, an attacker could induce the AI agent to construct image URLs encoding sensitive information from the workspace or conversation context, exfiltrating it to attacker-controlled servers. The workspace trust enforcement introduced in v1.71.0 mitigates the documented attack chain by disabling AI features in untrusted workspaces.

References

External links from the advisory. They lead to third-party sites.