CVE-2026-21259

CVSS Score & Metrics

Base Score

7.8 / 10

Vector String

                                        CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H                                    

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to elevate privileges locally.

Published Date

February 10, 2026

Last Modified

February 11, 2026

CWE ID

CWE-122

Source

NVD

Vendor

microsoft

Product

365_apps