Input validation error in Microsoft Word and Microsoft Office for macOS - CVE-2026-70105
Published: August 21, 2026
Vulnerability identifier: #VU144543
CSH Severity: Medium
CVSS v4: 6.7 [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]
CVE-ID: CVE-2026-70105
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to improper input validation in Microsoft Office Word when parsing a crafted document. A remote attacker can trick the victim into opening a specially crafted file to disclose sensitive information.
The disclosed information may include small portions of heap memory, and the Preview Pane is not an attack vector.
Affected software
Microsoft Word
Microsoft Office for macOS
Microsoft Office for macOS
How to mitigate CVE-2026-70105
Install security update from vendor's website.
Microsoft Word - update to 16.0.5565.1000
Microsoft Office for macOS - update to 16.112.26081010
Microsoft Office for macOS - update to 16.112.26081010