Detections
Analytics

Security Updates for Microsoft Excel Products (June 2026)

high Nessus Plugin ID 320185

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:

 - Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally. (CVE-2026-44817, CVE-2026-44818, CVE-2026-44820, CVE-2026-44823, CVE-2026-45469)

 - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network. (CVE-2026-44822, CVE-2026-45455)

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 KB5002877 to address this issue.

See Also

https://support.microsoft.com/en-us/help/5002877

Plugin Details

Severity: High

ID: 320185

File Name: smb_nt_ms26_jun_excel.nasl

Version: 1.2

Type: Local

Agent: windows

Published: 6/9/2026

Updated: 6/10/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.3

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

CVSS Score Source: CVE-2026-44822

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.1

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:microsoft:excel

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Ease: No known exploits are available

Patch Publication Date: 6/9/2026

Vulnerability Publication Date: 6/9/2026

Reference Information

CVE: CVE-2026-44817, CVE-2026-44818, CVE-2026-44820, CVE-2026-44822, CVE-2026-44823, CVE-2026-45455, CVE-2026-45469

MSFT: MS26-5002877

MSKB: 5002877