CVE-2026-21260

HIGH

Microsoft Office Outlook - Info Disclosure

Title source: llm
STIX 2.1

Description

Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.

References (1)

Scores

CVSS v3 7.5
EPSS 0.0005
EPSS Percentile 15.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-200
Status published
Products (16)
microsoft/365_apps (2 CPE variants)
Microsoft/Microsoft 365 Apps for Enterprise 16.0.1 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office 2019 19.0.0 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office LTSC 2021 16.0.1 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office LTSC 2024 16.0.0 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Outlook 2016 16.0.0.0 - 16.0.5539.1002
Microsoft/Microsoft SharePoint Enterprise Server 2016 16.0.0 - 16.0.5539.1002
Microsoft/Microsoft SharePoint Server 2019 16.0.0 - 16.0.10417.20097
Microsoft/Microsoft SharePoint Server Subscription Edition 16.0.0 - 16.0.19127.20518
microsoft/office 2019 (2 CPE variants)
... and 6 more
Published Feb 10, 2026
Tracked Since Feb 18, 2026