Detections
Analytics

Security Updates for Microsoft Exchange Server (August 2026)

high Nessus Plugin ID 334612

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Synopsis

The Microsoft Exchange Server installed on the remote host is affected by multiple vulnerabilities.

Description

The Microsoft Exchange Server installed on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities:

 - Improper control of resource identifiers ('resource injection') in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network. (CVE-2026-62910)

 - Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network. (CVE-2026-62911)

 - Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network. (CVE-2026-62913)

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:
 -KB5121573
 -KB5121574
 -KB5121575
 -KB5121576

See Also

https://support.microsoft.com/help/5121573

https://support.microsoft.com/help/5121574

https://support.microsoft.com/help/5121575

https://support.microsoft.com/help/5121576

Plugin Details

Severity: High

ID: 334612

File Name: smb_nt_ms26_aug_exchange.nasl

Version: 1.4

Type: Local

Agent: windows

Published: 8/11/2026

Updated: 8/24/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.9

Percentile: 99.36

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 7

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

CVSS Score Source: CVE-2026-65813

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.9

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

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

Vulnerability Information

CPE: cpe:/a:microsoft:exchange_server:2016, cpe:/a:microsoft:exchange_server:subscription_edition

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/11/2026

Vulnerability Publication Date: 8/11/2026

Reference Information

CVE: CVE-2026-62910, CVE-2026-62911, CVE-2026-62912, CVE-2026-62913, CVE-2026-62914, CVE-2026-62915, CVE-2026-65813

CWE: 122, 294, 502, 79, 862, 918, 99

IAVA: 2026-A-0836

MSFT: MS26-5121573, MS26-5121574, MS26-5121575, MS26-5121576

MSKB: 5121573, 5121574, 5121575, 5121576