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Google's AP2 protocol vulnerable to pre-authorization attacks, study finds

By PulseAugur Editorial · [1 sources] ·

A new security analysis of Google's Agent Payments Protocol (AP2) has identified significant vulnerabilities, even in its updated v0.2 version. The research highlights that while signed mandates protect transaction data post-signing, the protocol remains susceptible to manipulation before authorization. This includes attacks via Agent-to-Agent Protocol (A2A) messages and Model Context Protocol (MCP) tool calls, which can alter a transaction's context and potentially deviate from user intent. The study developed a testbed and proof-of-concept demonstrations for eight high-risk threats. AI

IMPACT Highlights critical security flaws in LLM payment protocols, potentially impacting secure AI agent transactions.

RANK_REASON Academic paper detailing security analysis of a specific protocol. [lever_c_demoted from research: ic=1 ai=1.0]

Read on arXiv cs.AI →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Google's AP2 protocol vulnerable to pre-authorization attacks, study finds

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43 / 100
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Academic paper detailing security analysis of a specific protocol. [lever_c_demoted from research: ic=1 ai=1.0]
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COVERAGE [1]

  1. arXiv cs.AI TIER_1 English(EN) · Avital Aviv, Parth A. Gandh, Ron Bitton, Asaf Shabtai ·

    Beyond the Mandate: A Systematic Security Analysis of the Agent Payments Protocol (AP2)

    arXiv:2608.23858v1 Announce Type: cross Abstract: The Agent Payments Protocol (AP2), introduced by Google, enables large language model (LLM)-driven shopping agents to authorize and execute payments on behalf of users. Its signed Checkout and Payment Mandates protect the integrit…

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