CVE-2026-21511

Published Feb 10, 2026

Last updated 19 days ago

Overview

Description
Deserialization of untrusted data in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
Source
secure@microsoft.com
NVD status
Analyzed
Products
365_apps, office, office_long_term_servicing_channel, sharepoint_server, word

Risk scores

CVSS 3.1

Type
Primary
Base score
7.5
Impact score
3.6
Exploitability score
3.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Severity
HIGH

Weaknesses

secure@microsoft.com
CWE-502

Social media

Hype score
Not currently trending

Configurations

References

Sources include official advisories and independent security research.