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7.8

Microsoft Office Word Local Code Execution Vulnerability

CVE-2026-45457 · published 4 months ago
Summary

An attacker can execute malicious code on a victim's computer by exploiting a weakness in Microsoft Office Word. This could lead to unauthorized access to sensitive data or system compromise. To mitigate this risk, ensure all Microsoft Office Word installations are up-to-date with the latest security patches.

What to do
  • Update microsoft microsoft 365 apps for enterprise to version https://aka.ms/OfficeSecurityReleases or later.
  • Update microsoft microsoft office 365 for mac to version 16.110.26061317 or later.
  • Update microsoft microsoft office ltsc for mac 2021 to version 16.110.26061317 or later.
  • Update microsoft microsoft office ltsc for mac 2024 to version 16.110.26061317 or later.
Affected software
VendorProductAffected versions
microsoft 365_apps All versions
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*
microsoft microsoft_365 All versions
cpe:2.3:a:microsoft:microsoft_365:-:*:*:*:*:macos:*:*
microsoft office_2021 All versions
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:macos:-:*
microsoft office_2024 All versions
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:macos:-:*
microsoft microsoft 365 apps for enterprise < https://aka.ms/OfficeSecurityReleases
microsoft microsoft office 365 for mac < 16.110.26061317
microsoft microsoft office ltsc for mac 2021 < 16.110.26061317
microsoft microsoft office ltsc for mac 2024 < 16.110.26061317
Original advisory text
Microsoft Word Remote Code Execution Vulnerability
Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to execute code locally.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
7.8 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-125Out-of-bounds Read
Timeline
Published9 Jun 2026
Updated4 Nov 2026
First seen11 Jun 2026
Sources
CVE-2026-45457 · NVD
CVE-2026-45457 · MITRE
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