What is CVE-2026-65656?

CVE-2026-65656 is a high-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under Command Injection. CVSS score: 7.8/10. Published 2026-08-11.

How severe is CVE-2026-65656?

High severity. CVSS v3 base score is 7.8 out of 10.

RCE in Microsoft 365 Apps For Enterprise

CVE-2026-65656

Improper neutralization of special elements used in a command ('command injection') in Microsoft Office allows an unauthorized attacker to execute code locally.

Vulnerability class: Command Injection (OS Command Injection)

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Microsoft 365 Apps For Enterprise — versions 16.0.1
Microsoft Office 2019 — versions 19.0.0
Microsoft Office Ltsc 2021 — versions 16.0.1
Microsoft Office Ltsc 2024 — versions 16.0.0

Weakness classification (CWE)

CWE-77 — Command Injection

References

Microsoft Office Remote Code Execution Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-65656?: CVE-2026-65656 is a high-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under Command Injection. CVSS score: 7.8/10. Published 2026-08-11.
How severe is CVE-2026-65656?: High severity. CVSS v3 base score is 7.8 out of 10.