Description
Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Affected products
microsoft: 365 apps; microsoft: excel; microsoft: office; microsoft: office long term servicing channel; microsoft: office online server
References1
- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59233 Vendor Advisory
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 1% percentile: 45 · as of 9 November 2026
- CWE
- CWE-843
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.