CVE-2026-24299 is a command injection vulnerability identified in Microsoft 365 Copilot, a productivity assistant integrated into Microsoft 365 services. The root cause is improper neutralization of special elements used in commands (CWE-77), which allows attackers to inject malicious commands into the system. This vulnerability enables unauthorized attackers to disclose sensitive information over a network by exploiting the way Copilot processes input commands. The CVSS v3.1 base score is 5.3 (medium), reflecting network attack vector (AV:N), high attack complexity (AC:H), no privileges required (PR:N), and requiring user interaction (UI:R). The scope is unchanged (S:U), and the impact is high on confidentiality (C:H), with no impact on integrity (I:N) or availability (A:N). The exploitability is limited by the need for user interaction and the complexity of crafting a successful injection. Currently, no known exploits exist in the wild, and no patches have been released. The vulnerability was reserved in January 2026 and published in March 2026. This issue highlights the importance of robust input validation and sanitization in AI-driven productivity tools that interpret user commands and interact with backend systems.

If exploited, this vulnerability could lead to unauthorized disclosure of sensitive information within organizations using Microsoft 365 Copilot. Attackers could leverage this flaw to extract confidential data, potentially including user inputs, internal documents, or system information accessible through Copilot’s command processing. Although the vulnerability does not affect data integrity or system availability, the confidentiality breach could have serious consequences such as data leaks, compliance violations, and reputational damage. The requirement for user interaction and high attack complexity reduces the likelihood of widespread exploitation but targeted attacks against high-value organizations remain a concern. Organizations relying heavily on Microsoft 365 Copilot for business-critical workflows and sensitive data processing are at increased risk. The absence of known exploits and patches means organizations must proactively mitigate exposure to prevent potential future attacks.

Organizations should implement strict input validation and sanitization controls on all user inputs processed by Microsoft 365 Copilot to prevent injection of special command elements. Until an official patch is released, limit Copilot’s exposure by restricting access to trusted users and environments. Educate users to recognize and avoid interacting with suspicious or unexpected prompts that could trigger malicious commands. Monitor network traffic and logs for unusual data disclosures or command execution patterns indicative of exploitation attempts. Employ endpoint detection and response (EDR) solutions to detect anomalous behaviors related to command injection. Coordinate with Microsoft support for updates and apply patches promptly once available. Consider deploying additional network segmentation and data loss prevention (DLP) controls to minimize the impact of any potential data leakage. Regularly review and update security policies related to AI assistant usage and command execution.