Your AI Email Assistant May Be Spying On You: What You Need To Know

Browser extensions that promise to supercharge your email writing with artificial intelligence might seem like a productivity boon. However, recent findings from Unit 42, a prominent cybersecurity research division, uncover a disturbing truth. These seemingly helpful tools can be malicious, stealing sensitive information, intercepting prompts, and even pilfering passwords. In the following Q&A, we break down the risks, how these extensions operate, and steps you can take to stay safe.

1. What exactly did Unit 42 discover about AI browser extensions?

Unit 42 identified a growing class of browser add-ons that masquerade as AI-powered assistants for tasks like email composition. Underneath the surface, these extensions are engineered to perform malicious activities. They can read your emails, capture keyboard inputs, intercept prompts you type into the AI, and even extract saved passwords from your browser’s credential manager. The very tools designed to boost your efficiency become a vector for data theft and surveillance. This revelation underscores a major blind spot: many users trust browser extensions without verifying their security, opening the door to sophisticated attacks.

2. How do these malicious extensions trick users into installing them?

These extensions are cloaked as legitimate productivity tools, often appearing in official browser stores with polished descriptions and positive reviews. They promise to draft email responses, summarize conversations, or generate tone suggestions—capabilities that seem harmless and useful. Once installed, they request broad permissions like “access to your data on all websites” or “read and change all your data on the websites you visit.” Users, eager to test the AI features, often grant these permissions without a second thought. The extensions then operate silently, collecting data in the background while delivering their promised functionality to maintain an illusion of legitimacy.

3. What specific types of data are these extensions stealing?

The stolen data falls into three main categories. First, email contents and metadata: every message you write or read can be copied and exfiltrated. Second, AI prompts and interactions: any text you enter into the AI interface (including private conversations) is intercepted. Third, credentials and passwords: by monitoring form fields and accessing browser storage, the extensions can harvest login information. In more advanced cases, they may also capture screenshots, clipboard data, and browsing history. This comprehensive data grab gives attackers a detailed profile of your personal and professional life, enabling identity theft, corporate espionage, or targeted phishing attacks.

4. Why are these extensions considered “high-risk” by security researchers?

They are labeled high-risk because of the combination of privilege and subtlety. Unlike typical malware that crashes your system or displays pop-ups, these extensions operate covertly within the trusted browser environment. They have legitimate permissions, yet they abuse them to exfiltrate data to remote servers. Their AI functionality provides perfect cover: users expect the extension to send data to an external AI service (like GPT), so network traffic appears normal. Additionally, since they often receive frequent updates, malicious code can be added or modified over time, making them persistent and hard to detect. The potential impact—loss of corporate secrets, personal sensitive data, or mass credential theft—is severe.

5. How can users protect themselves from these malicious browser extensions?

Protection requires a multi-layered approach. First, audit your installed extensions regularly: remove any you don’t recognize or no longer use. Second, carefully review permissions before installing; an email assistant shouldn’t need access to every website you visit. Third, stick to reputable developers and check reviews, number of downloads, and update history. Fourth, use security tools that monitor extension behavior (e.g., browser security extensions or endpoint detection software). Fifth, keep browsers updated to patch known vulnerabilities. Finally, be skeptical of free AI assistants that require broad data access—if the service is free, you might be the product. Unit 42 also recommends disabling any extension that requests permissions beyond its core function.

6. What should you do if you suspect an extension is compromised?

If you notice unusual behavior such as sudden pop-ups, redirected searches, slow browsing, or unfamiliar emails sent from your account, act immediately. Disable or uninstall the suspicious extension via your browser’s extension manager. Change all important passwords (especially email and banking) using a clean device. Scan your computer with updated antivirus or anti-malware software. Review your browser history and settings for any changes made by the extension. If sensitive data was exposed, notify your IT department or consider contacting relevant authorities for identity theft protection. Unit 42 advises that in high-risk scenarios, a full system reset may be necessary to ensure all traces of malicious code are removed.

7. Are there legitimate AI email assistants that are safe to use?

Yes, many well-known services offer AI writing assistance without compromising security. Legitimate extensions from reputable companies like Grammarly, Microsoft Editor, or market-specific tools backed by major tech firms generally have robust privacy policies and limited data access. However, even these require careful scrutiny. For example, check if the extension sends data to a third-party AI server—if so, understand what data is shared and anonymized. Look for extensions that are open source (allowing independent security audits) or those that process AI locally on your device (like some on-device GPT models). Ultimately, balance productivity gains with privacy risks: never grant permissions beyond what is strictly necessary.

8. What larger security lesson does this discovery highlight?

This revelation underscores a fundamental shift in cyber threats: from direct attacks on systems to subtle abuse of trust within browser ecosystems. Users increasingly depend on third-party extensions for daily tasks, often overlooking the fact that each extension is a small application with full access to your browsing session. The same convenience that makes AI-driven tools appealing also makes them a prime target for exploitation. The discovery by Unit 42 serves as a call to action for both individuals and organizations to adopt a principle of least privilege—grant only the minimum permissions needed—and to cultivate a culture of security awareness. As AI becomes more integrated into our workflows, the line between helpful assistant and silent spy will continue to blur.