Cloudanix VulnDB

CVE-2026-46580

High · 8.8

CVSS

8.8

EPSS

0.5%

Published

Jun 18, 2026

CISA due date

—

The record

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 packages

Ecosystem Package Introduced Fixed
npm @theia/ai-chat 0 1.71.0
npm @theia/ai-chat-ui 0 1.71.0
npm @theia/ai-claude-code 0 1.71.0
npm @theia/ai-code-completion 0 1.71.0
npm @theia/ai-core 0 1.71.0
npm @theia/ai-editor 0 1.71.0

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