**Critical Flaw in Microsoft Copilot Personal Exposes Data from Connected Apps**
A newly discovered vulnerability in Microsoft’s Copilot Personal has been found to allow a single click to exfiltrate sensitive data from connected applications, putting millions of users at risk. The issue lies in the way Copilot Personal handles user permissions and access control, allowing an attacker to exploit the system’s cross-domain privilege escalation capabilities.
The problem is that when a user grants permission for a connected app to interact with their Copilot Personal account, it creates a temporary bridge between the two systems. While this may seem like a convenient feature, it also provides an attack vector for malicious actors. An attacker can use this bridge to escalate privileges and extract sensitive data from other connected apps, potentially leading to a breach.
Microsoft’s Copilot Personal is designed to streamline user interactions with various applications by providing access to relevant information and automating tasks. However, the system relies on a complex set of permissions and access controls that can be exploited if not properly configured. The latest flaw highlights the risks associated with over-permissioning and the importance of implementing robust security measures.
The affected users include anyone who has connected their apps to Copilot Personal through Microsoft’s Azure Active Directory (Azure AD) or other identity management platforms. This includes businesses, governments, and individuals using Microsoft’s productivity software suite, such as Office 365 and Dynamics. The vulnerability affects all versions of Copilot Personal, including the latest updates.
The exploitation process involves tricking a user into granting excessive permissions to an attacker-controlled app, which can then be used to escalate privileges and extract sensitive data. This could include confidential business information, personal identifiable information (PII), or even financial data. The attack path is relatively straightforward, making it a significant concern for organizations that rely on Microsoft’s productivity software.
To mitigate this risk, users should review their connected apps and permissions regularly. This includes checking the list of connected apps and revoking any unnecessary access. Additionally, administrators should ensure that their Azure AD configurations are up-to-date and implement robust security measures to prevent cross-domain privilege escalation.
In light of this vulnerability, it’s essential for all Copilot Personal users to take immediate action to protect their sensitive data. By reviewing your connected apps and permissions regularly, you can minimize the risk of an attack. Remember that even seemingly minor vulnerabilities like this one can have significant consequences if left unaddressed.
Source: The Hacker News — 2026-08-18