Agentjacking

Your coding agent trusts the tools it reads. That trust is the vulnerability. When an attacker poisons a Sentry error report, a Datadog monitor alert, a PagerDuty incident, or a Jira ticket description with hidden prompt injection payloads, your agent doesn’t know the difference between a legitimate instruction and a hijack attempt. I’ve spent the last few months digging into this attack surface across the four most common integrations teams wire up to Claude Code, Cursor, and Codex. Here’s what I found and exactly how to fix it. ...

What Is Agentjacking? In June 2026, researchers at Tenet Security disclosed a new attack class they called agentjacking — and it’s the most practical AI agent supply chain attack I’ve seen in production. The premise is deceptively simple: an attacker injects a malicious error event into your Sentry project, and when your AI coding agent (Claude Code, Cursor, or OpenAI Codex CLI) reads that event via the Sentry MCP server, it executes the attacker’s embedded payload with your system privileges. ...