CVE-2026-26109

HIGH
2026-03-10 [email protected]
8.4
CVSS 3.1
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CVSS Vector

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

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
CVE Published
Mar 10, 2026 - 18:18 nvd
HIGH 8.4

Tags

Microsoft Information Disclosure Buffer Overflow Office Online Server 365 Apps Excel Office Office Long Term Servicing Channel

Description

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

Analysis

Arbitrary code execution in Microsoft Office Excel and related products (Office Online Server, 365 Apps) via out-of-bounds memory read allows local attackers to achieve complete system compromise without requiring user interaction or elevated privileges. This high-severity vulnerability affects multiple Microsoft Office components and currently lacks a security patch. …

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Remediation

Within 24 hours: Identify all systems running affected Excel versions and restrict file sharing capabilities; communicate vulnerability to all users with guidance on not opening untrusted Excel files. Within 7 days: Deploy network segmentation to limit Excel process privileges, implement file filtering on email gateways to block suspicious Excel attachments, and prepare alternative workflows for critical Excel-dependent processes. …

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Priority Score

42
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +42
POC: 0

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CVE-2026-26109 vulnerability details – vuln.today
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