CVE-2026-46580
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk19th percentile — higher than 19% of all known CVEs
Summary
In Eclipse Theia versions prior to 1.71.0, files matching the pattern .prompts/*.prompttemplate in a workspace were automatically loaded, which 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.
Risk Assessment
This enables attackers to carry out attack chains leading to data exfiltration via Markdown image rendering or arbitrary command execution via task definitions. Organizations may face serious data security threats.
Recommendation
It is recommended to update Eclipse Theia to version 1.71.0 or later to mitigate the risk associated with the automatic loading of malicious template files. Additionally, access to untrusted workspaces should be restricted.
Original NVD description (English source)
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.