What is CVE-2026-24299?

CVE-2026-24299 is a medium-severity vulnerability in Microsoft 365 Copilot, classified under Command Injection. CVSS score: 5.3/10. Published 2026-03-19.

How severe is CVE-2026-24299?

Medium severity. CVSS v3 base score is 5.3 out of 10.

RCE in Microsoft 365 Copilot

CVE-2026-24299

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.000 (14.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C.

Affected products

Microsoft 365 Copilot

Weakness classification (CWE)

CWE-77 — Command Injection

References

M365 Copilot Information Disclosure Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-24299?: CVE-2026-24299 is a medium-severity vulnerability in Microsoft 365 Copilot, classified under Command Injection. CVSS score: 5.3/10. Published 2026-03-19.
How severe is CVE-2026-24299?: Medium severity. CVSS v3 base score is 5.3 out of 10.