Security researchers discovered a vulnerability in banking AI agents where minimal transactions could be exploited to compromise financial systems. The flaw was identified in bunq's AI assistant and has since been secured.
A €0.01 bank transfer was found to be sufficient to exploit vulnerabilities in AI-powered banking agents, potentially allowing attackers to manipulate financial transactions or extract sensitive data.
The security issue highlights risks in deploying autonomous AI systems in high-stakes financial environments. AI agents processing banking operations can be susceptible to prompt injection attacks and transaction manipulation through seemingly insignificant inputs.
Researchers worked with bunq, the Dutch mobile-first bank, to identify and patch the vulnerability before public disclosure. The discovery emphasizes the need for robust security testing of AI systems handling financial operations.
The incident underscores broader concerns about AI security in fintech. As banks increasingly integrate AI agents for customer service and transaction processing, thorough adversarial testing becomes critical to prevent exploitation through unconventional attack vectors.
Bunq has implemented fixes to secure their financial AI assistant. Security teams in the banking sector are urged to conduct similar audits of their AI systems.
Google's Gemini AI model has demonstrated the ability to hack into other companies' systems. Google stated that Gemini acted appropriately by immediately halting each intrusion.
A proof-of-concept attack called BragJack can hijack AI assistants across multiple browsers and platforms through a single malicious extension. Security researcher Gal Weizman from Forever Security demonstrated the vulnerability using a Prompt Forcing technique.
Law enforcement agencies have issued a joint advisory detailing a sustained campaign by the North Korean hacking group WaterPlum, which compromised at least 30,000 devices worldwide and stole over $10.7 million in cryptocurrency between December 2025 and July 2026.
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