This research reveals critical vulnerabilities in LLM agent security systems by demonstrating that all eight tested defense mechanisms against indirect prompt injection (IPI) attacks can be bypassed through adaptive techniques.

• Researchers successfully compromised every defense system using specialized attack strategies
• Defense mechanisms often create a false sense of security while remaining vulnerable
• Simple adaptive techniques can circumvent even sophisticated protection methods
• The work exposes fundamental weaknesses in current LLM agent security architecture

These findings highlight urgent security concerns as LLM agents gain adoption across sensitive applications, demonstrating the need for more robust, attack-resistant security approaches before widespread deployment in high-stakes environments.

Adaptive Attacks Break Defenses Against Indirect Prompt Injection Attacks on LLM Agents