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Prompt-Injection Bug Hits $4B Agentic AI App 'Manus'

September 24, 2026 · Dark Reading · Severity: MEDIUM

AI apps that interpret external data (read: most AI apps) need exceptionally rigorous security filters, or attackers can take advantage.

Key Takeaways

  • A prompt-injection bug has been discovered in the Manus agentic AI application valued at $4 billion, demonstrating that security vulnerabilities remain a serious concern even in high-value AI platforms.
  • Prompt injection vulnerabilities in agentic AI apps enable attackers to manipulate AI behavior by inserting malicious instructions into seemingly benign inputs.
  • Organizations deploying agentic AI applications should implement input sanitization, output validation, and permission controls to mitigate prompt injection risks.
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