What is CVE-2026-124228?

CVE-2026-124228 is a high-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under Path Traversal. CVSS score: 8.8/10. Published 2026-11-10.

How severe is CVE-2026-124228?

High severity. CVSS v3 base score is 8.8 out of 10.

Path Traversal in Microsoft 365 Apps For Enterprise

CVE-2026-124228

Improper limitation of a pathname to a restricted directory ('path traversal') in Microsoft Office Outlook allows an authorized attacker to execute code over a network.

Vulnerability class: Path Traversal (Directory Traversal)

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

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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-22 — Path Traversal

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-124228 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-124228?: CVE-2026-124228 is a high-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under Path Traversal. CVSS score: 8.8/10. Published 2026-11-10.
How severe is CVE-2026-124228?: High severity. CVSS v3 base score is 8.8 out of 10.