CVE-2026-21260

high Microsoft
CVSS v3 Base Score
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
EPSS Score
0.0%
Exploitation probability in 30 days
Top 89% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
None
Availability
None
Published: February 10, 2026 (93 days ago)
Last Modified: March 13, 2026
Vendor: Microsoft
Source: MITRE

Description

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

CWE

CWE-200

Affected Products

Microsoft Microsoft 365 Apps for EnterpriseMicrosoft Microsoft Office 2019Microsoft Microsoft Office LTSC 2021Microsoft Microsoft Office LTSC 2024Microsoft Microsoft Outlook 2016Microsoft Microsoft SharePoint Enterprise Server 2016Microsoft Microsoft SharePoint Server 2019Microsoft Microsoft SharePoint Server Subscription Edition

References

🔗 msrc.microsoft.com