Detections
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Security Updates for Microsoft Office Products (August 2026)

medium Nessus Plugin ID 334616

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Synopsis

The Microsoft Office Products are affected by multiple vulnerabilities.

Description

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

 - Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally. (CVE-2026-63513, CVE-2026-63533, CVE-2026-65661)

 - Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to execute code locally. (CVE-2026-63532, CVE-2026-64903)

 - Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally. (CVE-2026-63517, CVE-2026-63524, CVE-2026-63529, CVE-2026-64899)

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 the following security updates to address this issue:
 - KB5002791
 - KB5002795
 - KB5002897
 - KB5002900
 - KB5002902

See Also

https://support.microsoft.com/en-us/help/5002791

https://support.microsoft.com/en-us/help/5002795

https://support.microsoft.com/en-us/help/5002897

https://support.microsoft.com/en-us/help/5002900

https://support.microsoft.com/en-us/help/5002902

Plugin Details

Severity: Medium

ID: 334616

File Name: smb_nt_ms26_aug_office.nasl

Version: 1.3

Type: Local

Agent: windows

Published: 8/11/2026

Updated: 8/21/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 96.78

CVSS v2

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 3.6

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

CVSS Score Source: CVE-2026-63524

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

CVSS Score Source: CVE-2026-70317

Vulnerability Information

CPE: cpe:/a:microsoft:office

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-2026-63513, CVE-2026-63515, CVE-2026-63517, CVE-2026-63524, CVE-2026-63526, CVE-2026-63529, CVE-2026-63532, CVE-2026-63533, CVE-2026-64899, CVE-2026-64903, CVE-2026-64909, CVE-2026-65661, CVE-2026-70317

IAVA: 2026-A-0835

MSFT: MS26-5002791, MS26-5002795, MS26-5002897, MS26-5002900, MS26-5002902

MSKB: 5002791, 5002795, 5002897, 5002900, 5002902