CVE-2026-81954 Microsoft Office Excel - Use After Free

Microsoft Office Excel contains a use after free vulnerability that allows unauthorized attackers to execute code locally, exploit requires local access to the system.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.47% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
8 September 2026
Updated
15 October 2026
Weakness
CWE-416

Vendor fix

Update to the latest version of Microsoft Office Excel.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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