Detections
Analytics
Microsoft Exchange Server (September 2026)
critical Nessus Plugin ID 343866
Language:
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:- Double free in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.
(CVE-2026-55007)
- External control of file name or path in Microsoft Exchange Server allows an authorized attacker to execute code over a network. (CVE-2026-69355)
- Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network. (CVE-2026-69356)
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 a security update for Microsoft Exchange Server. Apply the applicable Security Update for your Exchange Server version.See Also
https://support.microsoft.com/help/5121608
https://support.microsoft.com/help/5121609
Plugin Details
Severity: Critical
ID: 343866
File Name: smb_nt_ms26_sep_exchange.nasl
Version: 1.5
Type: Local
Agent: windows
Family: Windows : Microsoft Bulletins
Published: 9/8/2026
Updated: 9/16/2026
Supported Sensors: Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5
Percentile: 93.45
CVSS v2
Risk Factor: High
Base Score: 9.4
Temporal Score: 7
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N
CVSS Score Source: CVE-2026-69356
CVSS v3
Risk Factor: Critical
Base Score: 9.3
Temporal Score: 8.1
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/a:microsoft:exchange_server:2016, cpe:/a:microsoft:exchange_server:2019, cpe:/a:microsoft:exchange_server:subscription_edition
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-2026-55007, CVE-2026-69355, CVE-2026-69356, CVE-2026-69361, CVE-2026-69375, CVE-2026-69378, CVE-2026-69380, CVE-2026-69382, CVE-2026-69641