CVE-2026-33111 Copilot Chat (Microsoft Edge) Information Disclosure Vulnerability

CVE-2026-33111 is a command injection vulnerability affecting the Copilot Chat feature within Microsoft Edge. The vulnerability stems from improper neutralization of special elements used in a command, potentially enabling an attacker to inject arbitrary commands. Successful exploitation allows an unauthorized attacker to disclose sensitive information over a network. This vulnerability could allow attackers to gather intelligence about a target system or network, potentially leading to further compromise.

Attack Chain

1. An attacker crafts a malicious input containing command injection sequences.
2. The attacker sends this input to the Copilot Chat interface within Microsoft Edge.
3. The Copilot Chat feature processes the input without proper sanitization or validation.
4. The injected command is executed by the underlying system or application.
5. The injected command retrieves sensitive information from the system.
6. The retrieved information is transmitted over the network to the attacker.

Impact

Successful exploitation of CVE-2026-33111 can lead to the disclosure of sensitive information, potentially impacting the confidentiality of data processed by Microsoft Edge’s Copilot Chat. The scope of the information disclosure depends on the privileges of the process running Copilot Chat and the commands that can be injected.

Recommendation

• Apply the security update provided by Microsoft to patch CVE-2026-33111 in Copilot Chat (Microsoft Edge).
• Deploy the Sigma rule to your SIEM to detect potential exploitation attempts targeting CVE-2026-33111.
• Monitor network traffic for suspicious outbound connections originating from Microsoft Edge processes after the update to confirm successful remediation.