8.4
High
CVE-2026-46580 In Eclipse Theia versions prior to 1.71.0, files matching the pattern .prompts/*.prompttemplate in a workspace were…
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 and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Eclipse Theia 1.71 | earliest → < 1.71.0 | 1.71.0 |
Other CVEs of Eclipse Theia
The 12 CVEs of Eclipse Theia →
CVE-2026-82217
In Eclipse Theia versions 1.73.0 up to but not including 1.75.0, the AI "Agent Mode" file-change tools…
8.8
High
CVE-2026-19884
In Eclipse Theia versions up to and including 1.69.0, opening a folder starts source control integration without…
8.4
High
CVE-2026-61891
In Eclipse Theia versions up to and including 1.73.1, the `@theia/filesystem` backend exposes HTTP file-download…
7.5
High
CVE-2026-60009
In Eclipse Theia versions up to and including 1.73.1, the `@theia/filesystem` backend binds `POST /file-upload` in every…
8.8
High