Detections
Analytics

Security Updates for Microsoft Word Products C2R (September 2026)

critical Nessus Plugin ID 344562

Synopsis

The Microsoft Word Products are affected by multiple vulnerabilities.

Description

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

 - Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network. (CVE-2026-69671, CVE-2026-69764, CVE-2026-72972, CVE-2026-72973, CVE-2026-78510, CVE-2026-78511, CVE-2026-78517, CVE-2026-78521, CVE-2026-80085)

 - Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network. (CVE-2026-69686, CVE-2026-69722, CVE-2026-69759, CVE-2026-78504)

 - Use after free in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
 (CVE-2026-78507, CVE-2026-78514)

 - Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network. (CVE-2026-78509)

 - Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information over a network. (CVE-2026-78502, CVE-2026-78503, CVE-2026-78522, CVE-2026-80079, CVE-2026-80088, CVE-2026-80090)

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: Critical

ID: 344562

File Name: smb_nt_ms26_sep_word_c2r.nasl

Version: 1.1

Type: Local

Agent: windows

Family: Windows

Published: 9/10/2026

Updated: 9/10/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 96.6

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-2026-78510

CVSS v3

Risk Factor: Critical

Base Score: 9.8

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

Vulnerability Information

CPE: cpe:/a:microsoft:word

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Patch Publication Date: 9/8/2026

Vulnerability Publication Date: 9/8/2026

Reference Information

CVE: CVE-2026-69442, CVE-2026-69626, CVE-2026-69671, CVE-2026-69686, CVE-2026-69719, CVE-2026-69722, CVE-2026-69734, CVE-2026-69759, CVE-2026-69764, CVE-2026-72972, CVE-2026-72973, CVE-2026-72974, CVE-2026-72976, CVE-2026-77901, CVE-2026-78502, CVE-2026-78503, CVE-2026-78504, CVE-2026-78506, CVE-2026-78507, CVE-2026-78509, CVE-2026-78510, CVE-2026-78511, CVE-2026-78512, CVE-2026-78514, CVE-2026-78517, CVE-2026-78520, CVE-2026-78521, CVE-2026-78522, CVE-2026-78524, CVE-2026-78525, CVE-2026-80079, CVE-2026-80080, CVE-2026-80085, CVE-2026-80088, CVE-2026-80090