CVE-2026-20955

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 365 Apps Office Office Online Server Office Long Term Servicing Channel

Description

Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Analysis

Arbitrary code execution in Microsoft Excel through unsafe pointer handling enables local attackers to achieve full system compromise without requiring elevated privileges. This vulnerability affects Microsoft 365 Apps, Office, Office Online Server, and Office Long Term Servicing Channel across multiple versions. …

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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: +0.1
CVSS: +39
POC: 0

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CVE-2026-20955 vulnerability details – vuln.today
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