Microsoft Patches Critical Copilot Vulnerability That Risked User Data Exposure
WASHINGTON, D.C. — Microsoft has addressed a significant security flaw in its Copilot AI assistant that allowed attackers to hijack user sessions and extract sensitive data through deceptively crafted links. The vulnerability, dubbed the “Reprompt” attack by cybersecurity researchers, exploited the close integration between Copilot and users’ Microsoft accounts, potentially exposing personal information without triggering any visible alerts.
Researchers at Varonis, a cybersecurity firm, uncovered the technique that could embed hidden commands within a seemingly innocuous Copilot link. Once clicked, the AI assistant would unknowingly execute those instructions in the background, leveraging the user’s authenticated session to access data such as past conversations and account-related personal details. Because the attack required only a single click and did not prompt any warnings or require additional installations, it posed a stealthy risk to users.
Microsoft Copilot, designed to enhance productivity by summarizing documents, drafting emails, and answering queries based on user data, maintains a persistent connection to the user’s Microsoft account. While the platform includes guardrails to protect sensitive information, the Reprompt attack demonstrated a way to circumvent these protections, raising concerns about the security of AI-powered tools tied to personal accounts.
The company responded swiftly after the vulnerability was reported, issuing a patch that closes the loophole and prevents malicious links from executing unauthorized commands. Users are advised to update their software promptly and exercise caution when clicking on Copilot links received via email or messaging platforms.
This incident highlights broader challenges in securing AI assistants that operate with deep access to user data. As AI tools become increasingly embedded in workplace and personal environments, ensuring robust protections against novel attack vectors remains critical. The Microsoft Security Blog provides ongoing updates and guidance on safeguarding AI integrations.
Cybersecurity experts recommend that users remain vigilant against phishing attempts and unfamiliar links, even when they appear to originate from trusted sources. The Cybersecurity and Infrastructure Security Agency (CISA) offers resources on identifying and mitigating phishing risks that can be exploited in such attacks.
This vulnerability follows a trend of increasingly sophisticated cyber threats targeting AI platforms. Recently, the Federal Bureau of Investigation has issued warnings about phishing campaigns leveraging AI-generated content to deceive users. The incident underscores the importance of collaboration between technology companies and federal agencies to protect critical digital infrastructure.
For users seeking to understand how to protect their information when using AI assistants, the Federal Trade Commission provides comprehensive advice on maintaining online privacy and security in an evolving technological landscape.
As AI continues to transform digital interactions, this episode serves as a reminder that convenience must be balanced with vigilance. Users are encouraged to keep their software updated, scrutinize unexpected communications, and follow best practices outlined by official cybersecurity authorities.
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