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8.0CRITICAL

Claude Code, Gemini CLI, GitHub Copilot Agents Vulnerable to Prompt Injection via Comments

📅 16 April 2026 at 08:33 UTC📰 Security WeekView original source ↗

A researcher has disclosed the details of the AI attack method he has named ‘Comment and Control’. The post Claude Code, Gemini CLI, GitHub Copilot Agents Vulnerable to Prompt Injection via Comments appeared first on SecurityWeek.

🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview

Claude Code, Gemini CLI, and GitHub Copilot Agents are vulnerable to prompt injection via comments, allowing an attacker to execute arbitrary code, potentially leading to unauthorized access or data exfiltration.

⚙️Technical Details
Affected Systems
Gemini CLIGitHub Copilot Agents
Attack Vectors
Prompt injection via comments
💥Impact Assessment
Severity: H
Who Is at Risk
Developers and organizations using Gemini CLI and GitHub Copilot Agents
🛡️Recommended Actions
1Implement strict comment validation and sanitization to prevent prompt injection.
2Regularly update Gemini CLI and GitHub Copilot Agents to the latest versions.
3Monitor system logs for suspicious activity related to comments or prompts.
📦Affected Products
Gemini CLIGitHub Copilot Agents

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