CVE-2026-20949

HIGH
2026-01-13 [email protected]
7.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 13, 2026 - 18:16 nvd
HIGH 7.8

Tags

Microsoft Office Long Term Servicing Channel 365 Apps

Description

Improper access control in Microsoft Office Excel allows an unauthorized attacker to bypass a security feature locally.

Analysis

Microsoft Office Excel in the Long Term Servicing Channel and 365 Apps contains an access control bypass vulnerability that allows a local attacker with user interaction to gain unauthorized access to sensitive data and modify or delete system resources. The vulnerability requires local access and user interaction to exploit, affecting the confidentiality, integrity, and availability of affected systems. …

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Remediation

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

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Priority Score

44
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +39
POC: 0

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CVE-2026-20949 vulnerability details – vuln.today
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