CVE-2026-21258

medium

Description

Improper input validation in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21258

Details

Source: Mitre, NVD

Published: 2026-02-10

Updated: 2026-02-11

Risk Information

CVSS v2

Base Score: 4.9

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:N/A:N

Severity: Medium

CVSS v3

Base Score: 5.5

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

Severity: Medium

EPSS

EPSS: 0.0006