Detections
Analytics

Security Updates for Microsoft Word Products (September 2026)

critical Nessus Plugin ID 344290

Synopsis

The Microsoft Word Products are affected by multiple vulnerabilities.

Description

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

 - External control of file name or path in Microsoft Office Word allows an unauthorized attacker to execute code locally. (CVE-2026-62804)

 - Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network. (CVE-2026-69556, CVE-2026-69671, CVE-2026-69764, CVE-2026-72972, CVE-2026-72973, 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)

 - Buffer over-read in Microsoft Office Word allows an unauthorized attacker to disclose information over a network. (CVE-2026-69719)

 - Out-of-bounds read in Microsoft Office Word allows an authorized attacker to disclose information locally. (CVE-2026-72976)

 - Null pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code over a network. (CVE-2026-77901)

 - Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information over a network. (CVE-2026-77911, CVE-2026-78502, CVE-2026-78503, CVE-2026-78522, CVE-2026-80079, CVE-2026-80090)

 - Improper null termination in Microsoft Office Word allows an unauthorized attacker to disclose information locally. (CVE-2026-78506)

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

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

 - Out-of-bounds read in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network. (CVE-2026-78520)

 - Use after free in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network. (CVE-2026-78525)

 - Double free in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
 (CVE-2026-80080)

 - Buffer over-read in Microsoft Office Word allows an unauthorized attacker to disclose information locally. (CVE-2026-83949, CVE-2026-83951)

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 KB5002923 to address this issue.

See Also

https://support.microsoft.com/en-us/help/5002923

Plugin Details

Severity: Critical

ID: 344290

File Name: smb_nt_ms26_sep_word.nasl

Version: 1.2

Type: Local

Agent: windows

Published: 9/9/2026

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

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-80085

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

CVSS Score Source: CVE-2026-78509

Vulnerability Information

CPE: cpe:/a:microsoft:word

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Ease: No known exploits are available

Patch Publication Date: 9/8/2026

Vulnerability Publication Date: 9/8/2026

Reference Information

CVE: CVE-2026-62804, CVE-2026-69556, CVE-2026-69671, CVE-2026-69686, CVE-2026-69719, CVE-2026-69722, CVE-2026-69759, CVE-2026-69764, CVE-2026-72972, CVE-2026-72973, CVE-2026-72976, CVE-2026-77901, CVE-2026-77911, CVE-2026-78502, CVE-2026-78503, CVE-2026-78504, CVE-2026-78506, CVE-2026-78509, CVE-2026-78511, CVE-2026-78514, CVE-2026-78517, CVE-2026-78520, CVE-2026-78521, CVE-2026-78522, CVE-2026-78525, CVE-2026-80079, CVE-2026-80080, CVE-2026-80085, CVE-2026-80090, CVE-2026-83949, CVE-2026-83951

MSFT: MS26-5002923

MSKB: 5002923