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

Summary

Impact: Information Disclosure. Microsoft rating: Critical. Not known to be exploited — Exploitation Less Likely. Customer action: Not required.

Details

Why are there no links to an update or instructions with steps that must be taken to protect from this vulnerability?
This vulnerability has already been fully mitigated by Microsoft. There is no action for users of this service to take. The purpose of this CVE is to provide further transparency.
Please see Toward greater transparency: Unveiling Cloud Service CVEs for more information.

Vulnerabilities 1

High 7.5

CVE-2026-33111

Copilot Chat (Microsoft Edge) Information Disclosure Vulnerability

Improper neutralization of special elements used in a command ('command injection') in Copilot Chat (Microsoft Edge) allows an unauthorized attacker to disclose information over a network.

Microsoft Copilot Chat (Microsoft Edge) Browsers

May 7, 2026

Revision history

2026-05-07 #1
Information published.

References

CVE-2026-33111 Copilot Chat (Microsoft Edge) Information Disclosure Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33111
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss