Detections
Analytics

Security Updates for Microsoft Excel Products (May 2026)

high Nessus Plugin ID 314351

Synopsis

The Microsoft Excel Products are missing a security update.

Description

The Microsoft Excel Products are missing a security update. They are, therefore, affected by multiple vulnerabilities:

 - Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
 (CVE-2026-40359)

 - Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally. (CVE-2026-40362)

 - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally. (CVE-2026-40360)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Microsoft has released KB5002865 to address this issue.

See Also

https://support.microsoft.com/en-us/help/5002865

Plugin Details

Severity: High

ID: 314351

File Name: smb_nt_ms26_may_excel.nasl

Version: 1.1

Type: Local

Agent: windows

Published: 5/12/2026

Updated: 5/12/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

CVSS v2

Risk Factor: High

Base Score: 9.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-40359

CVSS v3

Risk Factor: High

Base Score: 7.8

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: cpe:/a:microsoft:excel

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Patch Publication Date: 5/12/2026

Vulnerability Publication Date: 5/12/2026

Reference Information

CVE: CVE-2026-40359, CVE-2026-40360, CVE-2026-40362

MSFT: MS26-5002865

MSKB: 5002865