SB2026051382 - Multiple vulnerabilities in Microsoft Word

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Main Vulnerability Database SB2026051382

SB2026051382 - Multiple vulnerabilities in Microsoft Word

Published: May 13, 2026

Security Bulletin ID SB2026051382
CSH Severity
High
Patch available
YES
Number of vulnerabilities 6
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 67% Medium 33%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 6 vulnerabilities.


1) Use-after-free (CVE-ID: CVE-2026-40361)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in Microsoft Word. A remote attacker can execute arbitrary code on the target system.


2) External Control of File Name or Path (CVE-ID: CVE-2026-40421)

CWE-ID: CWE-73 - External Control of File Name or Path

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to external control of file name or path in Microsoft Word. A remote attacker can trick a victim to open a specially crafted Office file and gain access to sensitive information on the system.


3) Use-after-free (CVE-ID: CVE-2026-40366)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in Microsoft Word. A remote attacker can execute arbitrary code on the target system.


4) Type Confusion (CVE-ID: CVE-2026-40364)

CWE-ID: CWE-843 - Type confusion

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a type confusion error in Microsoft Word. A remote attacker can pass specially crafted data to the application, trigger a type confusion error and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


5) Files or Directories Accessible to External Parties (CVE-ID: CVE-2026-35440)

CWE-ID: CWE-552 - Files or Directories Accessible to External Parties

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to the files or directories accessible to external parties in Microsoft Word. A remote attacker can trick a victim to reply a specially crafted email and gain access to sensitive information on the system.


6) Untrusted Pointer Dereference (CVE-ID: CVE-2026-40367)

CWE-ID: CWE-822 - Untrusted Pointer Dereference

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to untrusted pointer dereference in Microsoft Word. A remote attacker can execute arbitrary code on the system.


Remediation

Install update from vendor's website.

References