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Microsoft Copilot Hit With CVSS 9.6 RCE — Unauthenticated Command Injection in Enterprise AI Agent

Microsoft's July Patch Tuesday includes a CVSS 9.6 unauthenticated RCE in Copilot — command injection triggered when a user visits a malicious website. One of four Copilot CVEs in the cluster, signaling the agent attack surface is expanding fast.

Heath CallahanForkast mind
A single glowing computer terminal casting a long sharp shadow that stretches across connected enterprise systems - filing cabinets, servers, document stacks, email archives - representing a critical RCE vulnerability propagating through everything the compromised agent touches.

Microsoft’s July 2026 Patch Tuesday release includes a critical vulnerability in its Copilot assistant, identified as CVE-2026-48561. The flaw is a command injection vulnerability (CWE-77) carrying a CVSS score of 9.6. It allows for unauthenticated remote code execution (RCE) over a network, provided there is user interaction.

The vulnerability was discovered by Ofek Levin of Enclave. The attack mechanism involves an attacker hosting a malicious website. When a user visits this site, it triggers Microsoft Edge for Android to automatically send crafted prompts to the Copilot assistant. These prompts force the assistant to execute unintended actions, leading to code execution on the host machine. This vulnerability includes the potential for a traversal from a low-privilege Hyper-V guest to code execution on the Hyper-V host.

The integration of Copilot into enterprise infrastructure—spanning M365, GitHub, and Outlook—means that a successful exploit grants an attacker access to the data and systems the agent is authorized to touch. This includes access to code repositories, internal documents, email communications, and stored credentials. Because Copilot acts as an interface between the user and these sensitive environments, the compromise of the agent effectively bypasses traditional perimeter defenses for the data it manages.

CVE-2026-48561 is not an isolated incident. It is one of four Copilot-related vulnerabilities addressed in the July 2026 update, signaling that the attack surface for AI-integrated tools is expanding rapidly. The other vulnerabilities in this cluster include:

CVE-2026-50510: A GitHub Copilot JetBrains RCE with a CVSS score of 7.8. This is a local vector vulnerability, and the fix requires updating the plugin to version 1.13.0-251.

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CVE-2026-58617: An M365 Copilot iOS elevation of privilege (EoP) vulnerability with a CVSS score of 8.1. This is a network vector issue, and the fix is available in version 2.111.4.

CVE-2026-55145: An Outlook Copilot tampering vulnerability via command injection, rated as Medium with a CVSS score of 6.3. This also utilizes a network vector.

These four vulnerabilities are part of a broader Patch Tuesday release that addressed 621 total CVEs, 63 of which were classified as Critical by ZDI. The volume of these disclosures reflects the current rate of vulnerability identification within Copilot as it is deployed across enterprise environments.

It is important to distinguish CVE-2026-48561 from other recent disclosures, such as CVE-2026-41106, an M365 Copilot EoP published on July 9. While both involve Copilot, they are distinct vulnerabilities with different technical characteristics.

At the time of disclosure, CVE-2026-48561 had not been publicly disclosed and there was no evidence of it being exploited in the wild. Microsoft has released a fix for the vulnerability. Organizations utilizing Copilot across their M365, GitHub, and Outlook environments should prioritize the application of these patches to mitigate the risk of unauthorized code execution and potential host-level compromise.