Out-of-bounds read in Microsoft Office for macOS and Microsoft Word - CVE-2026-63528
Published: August 12, 2026
Vulnerability identifier: #VU141936
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-2026-63528
CWE-ID: CWE-125
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 out-of-bounds read in Microsoft Office Word when parsing a crafted Office file. A remote attacker can trick the victim into opening a crafted file to disclose sensitive information.
An attacker who successfully exploits this issue could read portions of process memory. The Preview Pane is not an attack vector for this vulnerability.
Affected software
Microsoft Office for macOS
Microsoft Word
Microsoft Word
How to mitigate CVE-2026-63528
Install security update from vendor's website.
Microsoft Office for macOS - update to 16.112.26081010
Microsoft Word - update to 16.0.5565.1000
Microsoft Word - update to 16.0.5565.1000