What is CVE-2026-123395?

CVE-2026-123395 is a medium-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under Code Injection. CVSS score: 5.9/10. Published 2026-11-10.

How severe is CVE-2026-123395?

Medium severity. CVSS v3 base score is 5.9 out of 10.

RCE in Microsoft 365 Apps For Enterprise

CVE-2026-123395

Improper control of generation of code ('code injection') in Microsoft Office Excel allows an authorized attacker to disclose information locally.

Vulnerability class: RCE (Remote Code Execution)

Published 2026-11-10 · last modified 2026-11-10.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-94 — Code Injection

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-123395 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-123395?: CVE-2026-123395 is a medium-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under Code Injection. CVSS score: 5.9/10. Published 2026-11-10.
How severe is CVE-2026-123395?: Medium severity. CVSS v3 base score is 5.9 out of 10.