Untrusted Pointer Dereference in Microsoft products - CVE-2026-48580
Published: July 17, 2026
Vulnerability identifier: #VU138187
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-48580
CWE-ID: CWE-822
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Microsoft Office for macOS
Microsoft Excel
Office Online Server
Microsoft Office for macOS
Microsoft Excel
Office Online Server
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to untrusted pointer dereference in Microsoft Excel when parsing a crafted Office file. A remote attacker can send a specially crafted file to the victim to disclose sensitive information.
User interaction is required to open the crafted file, and the Preview Pane is not an attack vector. Successful exploitation could disclose small portions of heap memory.
How to mitigate CVE-2026-48580
Install security update from vendor's website.