Untrusted Pointer Dereference in Microsoft Office - CVE-2026-70300
Published: October 14, 2026
Vulnerability identifier: #VU154719
CSH Severity: High
CVSS v4: 9.3 [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]
CVE-ID: CVE-2026-70300
CWE-ID: CWE-822
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to untrusted pointer dereference in Microsoft Office Word when processing WordPerfect documents. A remote attacker can send a specially crafted WordPerfect document with a linked graphics file to a target user to execute arbitrary code.
The vulnerability can be triggered when the document is processed in the Reading Pane without the user opening it. The Preview Pane is also an attack vector.
Affected software
Microsoft Office
How to mitigate CVE-2026-70300
Install security update from vendor's website.
Microsoft Office - addressed in versions 16.0.14334.20974, 16.0.17932.21056