The Risk of Trusting AI Assistants With Your Data

According to a report from The Hacker News, security researchers discovered that Microsoft's consumer AI assistant, Copilot Personal, had flaws that could let an attacker steal data from connected apps with just one click. The attack worked by tricking the assistant into running a hidden prompt when a user opened a specially crafted link. This is significant because millions of people use AI assistants every day, often linking them to email, calendars, and cloud storage without thinking about the risks.

These kinds of vulnerabilities show a growing trend: attackers are finding ways to use AI tools against their own users. Instead of breaking into a system directly, they manipulate the AI itself into doing the dirty work. For Australian small and mid-sized businesses, this is a wake-up call about the hidden dangers that come with convenience-focused technology.

Why This Vulnerability Matters Beyond the Headlines

The most interesting part of this finding is how the researchers discovered the flaw. They asked the Copilot assistant why it couldn't run prompts automatically, and the assistant itself revealed the exact technical details needed to make it work. This "meta-hacking" approach — using the AI to expose its own weaknesses — is a clever new method for finding bugs and should worry every business relying on AI tools.

What also stands out is that the attack requires the user to already have connected services authorized. But once a user clicks the link, the assistant can silently grab emails, calendar events, file summaries, and even past conversations. The stolen data is then sent to an attacker's server using the same technical tricks the assistant uses to fetch web pages, making it very hard to detect. This means even cautious users could be compromised without seeing any warning signs.

What This Means for Australian SMBs

Many Australian small and mid-sized businesses use Microsoft tools like Outlook, Teams, and OneDrive. Employees might use Copilot Personal at home or on personal devices to boost productivity, often connecting it to work-related apps. This blurring of personal and professional accounts creates a serious security gap — an attacker only needs one employee to click a malicious link to expose company data stored in connected services.

Even if your business doesn't officially use Copilot, your staff may have signed up on their own. And because the vulnerability affects the consumer version, typical business security tools may not cover these personal accounts. Australian SMBs need to treat AI assistants like any other privileged user and review what data they can access.

What You Can Do Now

  • Ask employees which AI assistants they use for work tasks and check which third-party apps are connected to those accounts.
  • Remove any unnecessary connections — especially to email, calendars, and file storage — and disable automatic access where possible.
  • Train staff to never click links that open directly into AI assistant pages, even from trusted senders, unless they know exactly why.
  • Enable multi-factor authentication on all accounts and monitor for unusual data transfer patterns using available security logs.
  • Make sure all Microsoft products and connected apps are updated to the latest patched versions (Microsoft released a fix in August 2026 for this issue).

At MS&VG, we help Australian small and mid-sized businesses understand the real-world risks of new technology like AI assistants. Our team can review your current setup and recommend practical steps to keep your data safe without slowing down your day-to-day work. Get in touch for a quick consultation.