Detections
Analytics

Security Updates for Microsoft Excel Products C2R (August 2026)

high Nessus Plugin ID 335114

Synopsis

The Microsoft Excel Products are affected by multiple vulnerabilities.

Description

The Microsoft Excel Products are missing security updates. It is, therefore, affected by multiple vulnerabilities:

 - Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to execute code over a network. (CVE-2026-65807)

 - Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally. (CVE-2026-68794, CVE-2026-68796, CVE-2026-68798, CVE-2026-68800, CVE-2026-68801, CVE-2026-68805, CVE-2026-68807, CVE-2026-68812, CVE-2026-68815)

 - Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network. (CVE-2026-70327, CVE-2026-70328)

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 patches to address these issues.

For Office 365, Office 2016 C2R, or Office 2019, ensure automatic updates are enabled or open any office app and manually perform an update.

See Also

http://www.nessus.org/u?5931548c

Plugin Details

Severity: High

ID: 335114

File Name: smb_nt_ms26_aug_excel_c2r.nasl

Version: 1.1

Type: Local

Agent: windows

Family: Windows

Published: 8/13/2026

Updated: 8/13/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 96.81

CVSS v2

Risk Factor: Critical

Base Score: 10

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

CVSS Score Source: CVE-2026-65807

CVSS v3

Risk Factor: High

Base Score: 8.8

Vector: CVSS:3.0/AV:N/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: 8/11/2026

Vulnerability Publication Date: 8/11/2026

Reference Information

CVE: CVE-2026-65807, CVE-2026-68793, CVE-2026-68794, CVE-2026-68795, CVE-2026-68796, CVE-2026-68797, CVE-2026-68798, CVE-2026-68799, CVE-2026-68800, CVE-2026-68801, CVE-2026-68802, CVE-2026-68803, CVE-2026-68804, CVE-2026-68805, CVE-2026-68806, CVE-2026-68807, CVE-2026-68808, CVE-2026-68810, CVE-2026-68811, CVE-2026-68812, CVE-2026-68813, CVE-2026-68814, CVE-2026-68815, CVE-2026-68816, CVE-2026-68817, CVE-2026-70327, CVE-2026-70328