Vulnerability in Microsoft 365 Apps

CVE-2026-83949

Buffer over-read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Weakness classification (CWE)

CWE-126 — Buffer Over-read

References

secure@microsoft.com (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-83949?: CVE-2026-83949 is a medium-severity vulnerability in Microsoft 365 Apps, classified under Buffer Over-read. CVSS score: 5.5/10. Published 2026-09-08.
How severe is CVE-2026-83949?: Medium severity. CVSS v3 base score is 5.5 out of 10.