Google recently warned 1.8 billion Gmail users about a new cyber threat called Indirect Prompt Injection. This attack technique embeds hidden instructions into emails. For recipients, the email appears normal, but beneath the surface lies concealed text disguised with tricks such as zero-size fonts or white text on a white background.
When users ask an AI tool like Google Gemini to summarize the content of such an email, the AI does not only read the visible text but also the hidden instructions, which may trigger malicious actions.
How does this attack work?
The scenario is deceptively simple yet dangerous. After summarizing the email, the AI might add a false message such as: “Your account has been hacked. Click the following link to log in again.” Naturally, the link directs users to a phishing site.
Because this message comes directly from a trusted AI system, many users could be misled. This is a form of AI-driven phishing that is much harder to detect than traditional phishing methods.
Who can be targeted?
This threat does not discriminate. Individual users, company employees, and even large institutions could become victims. With Gmail’s massive user base, the potential scale of such attacks is enormous.
How to protect yourself from indirect prompt injection
To avoid falling into this trap, several precautions are recommended:
- Never provide passwords or sensitive information through AI.
- Always verify links carefully before clicking.
- Use email filters whenever possible.
- Disable AI features in email if you feel unsafe.
Awareness is the key. The more users understand this new method of attack, the less likely they are to become victims.
AI: A double-edged sword
This case is an important reminder that trust in AI can be exploited. On the one hand, AI helps boost productivity. On the other, if not used carefully, AI can become a gateway for dangerous attacks.
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