What is CVE-2026-33111?

CVE-2026-33111 is a high-severity vulnerability in Microsoft Copilot_chat, classified under Command Injection. CVSS score: 7.5/10. Published 2026-05-07.

How severe is CVE-2026-33111?

High severity. CVSS v3 base score is 7.5 out of 10.

RCE in Microsoft Copilot_chat

CVE-2026-33111

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.

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.001 (18.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Microsoft Copilot_chat
Microsoft Copilot Chat (Microsoft Edge)

Weakness classification (CWE)

CWE-77 — Command Injection

References

Copilot Chat (Microsoft Edge) Information Disclosure Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33111?: CVE-2026-33111 is a high-severity vulnerability in Microsoft Copilot_chat, classified under Command Injection. CVSS score: 7.5/10. Published 2026-05-07.
How severe is CVE-2026-33111?: High severity. CVSS v3 base score is 7.5 out of 10.