CVE-2026-100212

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

CVSS 3.1

8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

0.9% chance of exploitation in the next 30 days; higher than 59% of CVEs (scores of 2026-10-25)

CWE

CWE-416

Published

2026-10-13

Modified

2026-10-15

Record from

the NVD, synced 2026-10-19

Affected

• microsoft:365_apps
• microsoft:microsoft_365
• microsoft:office_2021
• microsoft:office_2024
• microsoft:office_online_server

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-100212

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