Detections
Analytics

Security Updates for Microsoft Word Products C2R (August 2026)

medium Nessus Plugin ID 335111

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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 locally.
 (CVE-2026-58651, CVE-2026-64915)

 - Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally. (CVE-2026-63527, CVE-2026-64907)

 - Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information locally. (CVE-2026-63521, CVE-2026-63528, CVE-2026-63530, CVE-2026-63531, CVE-2026-64917, CVE-2026-70310)

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: Medium

ID: 335111

File Name: smb_nt_ms26_aug_word_c2r.nasl

Version: 1.5

Type: Local

Agent: windows

Family: Windows

Published: 8/13/2026

Updated: 9/1/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 96.78

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2026-70310

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

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

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

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: 8/11/2026

Vulnerability Publication Date: 8/11/2026

Reference Information

CVE: CVE-2026-58651, CVE-2026-63521, CVE-2026-63525, CVE-2026-63527, CVE-2026-63528, CVE-2026-63530, CVE-2026-63531, CVE-2026-64905, CVE-2026-64907, CVE-2026-64915, CVE-2026-64917, CVE-2026-66806, CVE-2026-66809, CVE-2026-66810, CVE-2026-70310, CVE-2026-70311, CVE-2026-70318

IAVA: 2026-A-0835, 2026-A-0837