CVE-2026-21261

medium Microsoft
CVSS v3 Base Score
5.5
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
EPSS Score
0.0%
Exploitation probability in 30 days
Top 94% most likely to be exploited
Attack Characteristics
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Confidentiality
High
Integrity
None
Availability
None
Published: February 10, 2026 (93 days ago)
Last Modified: March 13, 2026
Vendor: Microsoft
Source: MITRE

Description

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

CWE

CWE-125

Affected Products

Microsoft Microsoft 365 Apps for EnterpriseMicrosoft Microsoft Excel 2016Microsoft Microsoft Office 2019Microsoft Microsoft Office LTSC 2021Microsoft Microsoft Office LTSC 2024Microsoft Microsoft Office LTSC for Mac 2021Microsoft Microsoft Office LTSC for Mac 2024Microsoft Office Online Server

References

🔗 msrc.microsoft.com