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First reported 21 Jul · updated 29 Aug · 3 reports embracethered.com

AWS Kiro: Arbitrary Code Execution via Indirect Prompt Injection

Researchers found a vulnerability (CVE-2026-10591) in AWS Kiro, an agentic IDE, where hidden instructions planted in a web page or source file that Kiro processes can trigger indirect prompt injection to rewrite Kiro's own MCP server configuration (~/.kiro/settings/mcp.json) or allowlist arbitrary Bash commands in .vscode/settings.json, achieving arbitrary code execution on the developer's machine with no approval prompt. The human-in-the-loop approval boundary is bypassed because Kiro can write to these config files without user consent, and AWS has issued a fix and CVE.

indirect-prompt-injection · prompt-injection · remote-code-execution · tool-abuse · config-poisoning
ai-agents · mcp · llm · agentic-ide

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First reported 20 Jul · updated yesterday · 4 reports appsentinels.ai

Deadbugz: Currently Active MCP Supply-Chain Campaign

The "Deadbugz" campaign is an active MCP supply-chain operation in which malicious Model Context Protocol servers (such as the zellkernel/productivity-suite-mcp package) embed hidden instructions in tool metadata to hijack trusted tools connected to an AI agent, enabling data exfiltration like reading .env files or SSH keys. The campaign leverages cross-tool poisoning, where one poisoned MCP server can abuse other trusted connectors already wired into the agent, and is tied to a malicious GitHub account and associated threat-actor persona.

First reported 3d ago dev.to

I broke an MCP server in 10 minutes — the exact prompt injection attack chain (with fixes)

A DEV Community write-up demonstrates an indirect prompt injection attack chain against a typical MCP server exposing read_file and send_email tools, where a submitted document containing a fake 'SYSTEM NOTE' instruction causes the model to exfiltrate /etc/passwd by email because no boundary separates data from instructions. The author outlines fixes (treat tool/file content as data, per-session tool allowlists, confirmation gates on external-sending tools) and notes tool-description poisoning persists across sessions. The post also promotes a free hosted scanner.

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