What is CVE-2026-45497?

CVE-2026-45497 is a high-severity vulnerability in Microsoft Copilot, classified under Command Injection. CVSS score: 7.7/10. Published 2026-06-04.

How severe is CVE-2026-45497?

High severity. CVSS v3 base score is 7.7 out of 10.

RCE in Microsoft Copilot

CVE-2026-45497

Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an authorized attacker to execute code over a network.

Vulnerability class: Command Injection (OS Command Injection)

Published 2026-06-04 · last modified 2026-07-23.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L.

EPSS exploit prediction

EPSS: 0.006 (48.0th percentile), scored 2026-10-18.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.002

Affected products

Weakness classification (CWE)

CWE-77 — Command Injection

References

Microsoft M365 Copilot Remote Code Execution Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-45497?: CVE-2026-45497 is a high-severity vulnerability in Microsoft Copilot, classified under Command Injection. CVSS score: 7.7/10. Published 2026-06-04.
How severe is CVE-2026-45497?: High severity. CVSS v3 base score is 7.7 out of 10.