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Google AI email summaries can be hacked to hide phishing attacks

16 Aug 2025 By foxnews

Artificial intelligence is everywhere these days - in your phone, your car, even your washing machine. I saw one just the other day featuring built-in AI. And while that might sound a little over the top, there's no denying that artificial intelligence has made life easier in a lot of ways.

From boosting productivity to unlocking new creative tools, it's changing how we work and live. The most common version you've probably encountered? Generative AI, think chatbots like ChatGPT. But as helpful as this tech can be, it's not without its problems.

If you've used Google's Workspace suite, you may have noticed the company's AI model, Gemini, integrated across apps like Docs, Sheets and Gmail. Now, researchers say attackers can manipulate Gemini-generated email summaries to sneak in hidden phishing prompts.

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HOW AI IS NOW HELPING HACKERS FOOL YOUR BROWSER'S SECURITY TOOLS

Researchers at Mozilla's 0Din have discovered a vulnerability in Google's Gemini for Workspace that allows attackers to inject hidden instructions into email summaries. The issue, demonstrated by Marco Figueroa, shows how generative AI tools can be misled through indirect prompt injection. This technique embeds invisible commands inside the body of an email. When Gemini summarizes the message, it interprets and acts on those hidden prompts.

WHAT IS ARTIFICIAL INTELLIGENCE (AI)?

The attack does not rely on suspicious links or attachments. Instead, it uses a combination of HTML and CSS to conceal the prompt by setting the font size to zero and the color to white. These commands remain invisible in Gmail's standard view but are still accessible to Gemini. Once you request a summary, the AI can be tricked into presenting fake security alerts or urgent instructions that appear to come from Google.

In a proof of concept, Gemini falsely warned a user that a Gmail password had been compromised and included a fake support phone number. Since Gemini summaries are integrated into Google Workspace, you are more likely to trust the information, making this tactic especially effective.

While Google has implemented defenses against prompt injection since 2024, this method appears to bypass current protections. The company told CyberGuy it is actively deploying updated safeguards.

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In a statement, a Google spokesperson said, "Defending against attacks impacting the industry, like prompt injections, has been a continued priority for us, and we've deployed numerous strong defenses to keep users safe, including safeguards to prevent harmful or misleading responses. We are constantly hardening our already robust defenses through red-teaming exercises that train our models to defend against these types of adversarial attacks."

Google also confirmed that it has not observed active exploitation of this specific technique.

So, how can you protect yourself from phishing scams that exploit AI tools like Gemini? Here are six essential steps you can take right now to stay safe:

Just because a summary appears in Gmail or Docs does not mean it is automatically safe. Treat AI-generated suggestions, alerts or links with the same caution you would any unsolicited message. Always verify critical information, such as security alerts or phone numbers, through official sources.

If an email seems unusual, especially if it is unexpected or from someone you do not recognize, avoid using the AI summary feature. Instead, read the full email as it was originally written. This lowers the chance of falling for misleading summaries.

Watch for emails or messages that create a sense of urgency, ask you to verify account details or provide unexpected links or contact information, even if they appear trustworthy or come from familiar sources. Attackers can use AI to craft realistic-looking alerts or requests for sensitive information, sometimes concealed within automatically generated summaries. So, always pause and scrutinize suspicious prompts before responding.

The best way to safeguard yourself from malicious links that install malware, potentially accessing your private information, is to have antivirus software installed on all your devices. This protection can also alert you to phishing emails and ransomware scams, keeping your personal information and digital assets safe.

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Ensure that Google Workspace and your browser are always running the latest version. Google regularly releases security updates that help prevent newer types of attacks. Also, avoid using unofficial extensions that have access to your Gmail or Docs.

AI-driven scams like the Gemini summary attack don't happen in a vacuum. They often begin with stolen personal information. That data might come from past breaches, public records or details you've unknowingly shared online. A data removal service can help by continuously scanning and requesting the removal of your information from data broker sites. While no service can wipe everything, reducing your digital footprint makes it harder for attackers to personalize phishing attempts or link you to known breach data. Think of it as one more layer of protection in a world where AI makes targeted scams even easier.

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If you're worried about falling for an AI-generated phishing attempt, consider disabling Gemini summaries in Gmail until Google rolls out stronger protections. You can still read full emails the traditional way, which can lower your risk of being misled by manipulated summaries.

How to disable Gemini features on desktop

How to disable Gemini features on mobile

On iPhone:

If you use the Gemini mobile app specifically:

On Android:

Settings may vary depending on your Android phone's manufacturer

Key caveats to know:

There is no centralized single "off switch" to completely remove all Gemini AI references everywhere, but these steps significantly reduce the feature's presence and risk.

This vulnerability highlights how phishing tactics are evolving alongside AI. Instead of relying on visible red flags like misspelled URLs or suspicious attachments, attackers are now targeting trusted systems that help users filter and interpret messages. As AI becomes more deeply embedded in productivity tools, prompt injection could emerge as a subtle but powerful vector for social engineering, hiding malicious intent in the very tools designed to simplify communication.

How comfortable are you letting AI summarize or filter your emails, and where do you draw the line? Let us know by writing to us at Cyberguy.com/Contact