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CVE-2026-46580: In Eclipse Theia versions prior to 1.71.0, files matching the pattern .prompts/*.prompttemplate in a…

Occurred
Jun 18, 2026
Published
Jun 18, 2026
Source
NVD CVE

Summary

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.

Tags

  • CVE
  • CVE-2026-46580
  • cvss:HIGH
  • agent-fail:injection-indirect
  • agent-cause:missing-guardrail

Classification

Category confidence: 95%
Severity confidence: 90%

Rationale: Malicious prompt templates in workspace files enabled indirect prompt injection leading to data exfiltration and command execution.

Classifier: Qwen/Qwen3.5-35B-A3B-FP8

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