Security Updates for Microsoft Outlook Products C2R (November 2026)

high Nessus Plugin ID 380232

Synopsis

The Microsoft Outlook Products are affected by multiple vulnerabilities.

Description

The Microsoft Outlook Products are missing security updates. It is, therefore, affected by multiple vulnerabilities:

- Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network. (CVE-2026-110043, CVE-2026-119995, CVE-2026-119996, CVE-2026-123376, CVE-2026-123377, CVE-2026-123379, CVE-2026-123380, CVE-2026-123383, CVE-2026-123384)

- Stack-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network. (CVE-2026-123375, CVE-2026-123381)

- Release of invalid pointer or reference in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network. (CVE-2026-111309)

- Untrusted pointer dereference in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network. (CVE-2026-123382)

- Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network. (CVE-2026-123385)

- Improper limitation of a pathname to a restricted directory ('path traversal') in Microsoft Office Outlook allows an authorized attacker to execute code over a network. (CVE-2026-124228)

- Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code locally. (CVE-2026-119997)

- Integer overflow or wraparound in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network. (CVE-2026-123378)

- Use of uninitialized resource in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network. (CVE-2026-124227)

- Access of resource using incompatible type ('type confusion') in Microsoft Office Outlook allows an unauthorized attacker to disclose information over a network. (CVE-2026-119993)

- Product ui does not warn user of unsafe actions in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network. (CVE-2026-124194)

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.

Plugin Details

Severity: High

ID: 380232

File Name: smb_nt_ms26_nov_outlook_c2r.nasl

Version: 1.1

Type: Local

Agent: windows

Family: Windows

Published: 11/13/2026

Updated: 11/13/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.5

Percentile: 98.11

CVSS v2

Risk Factor: Critical

Base Score: 10

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

CVSS Score Source: CVE-2026-110043

CVSS v3

Risk Factor: High

Base Score: 8.8

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

Vulnerability Information

CPE: cpe:/a:microsoft:outlook

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Ease: No known exploits are available

Patch Publication Date: 11/10/2026

Vulnerability Publication Date: 11/10/2026

CISA Known Exploited Vulnerability Due Dates: 11/24/2026

Reference Information

CVE: CVE-2026-110043, CVE-2026-111309, CVE-2026-119993, CVE-2026-119995, CVE-2026-119996, CVE-2026-119997, CVE-2026-123375, CVE-2026-123376, CVE-2026-123377, CVE-2026-123378, CVE-2026-123379, CVE-2026-123380, CVE-2026-123381, CVE-2026-123382, CVE-2026-123383, CVE-2026-123384, CVE-2026-123385, CVE-2026-124194, CVE-2026-124227, CVE-2026-124228

Detections

Analytics