CVE-2026-108446
Microsoft Office Excel Remote Code Execution Vulnerability
Microsoft Microsoft 365 Apps for EnterpriseApplications & CMS
CVSS
8.8HighExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.43%Chance of exploitation activity in the next 30 days, higher than 36% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 16.114.26101123Microsoft Office 365 for MacCVE List
- 16.0.14334.20974Microsoft Office LTSC 2021CVE List
- 16.0.17932.21056Microsoft Office LTSC 2024CVE List
- 16.114.26101123Microsoft Office LTSC for Mac 2021CVE List
- 16.114.26101123Microsoft Office LTSC for Mac 2024CVE List
- 16.0.10417.20228Office Online ServerCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Vendor and government advisories 1
Vendors that say their products are affected, and agencies that issued alerts. Check each for the fixed release of the product you run.
Reports 1
1 outlet mention it. Reports are not confirmation; each links to its source.
Description
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
Text from CVE List
Affected versions 7
- Microsoft 365 Apps for Enterpriseaffected: 16.0.1 before https://aka.ms/OfficeSecurityReleasesCVE List
- Microsoft Office 365 for Macaffected: 1.0.0 before 16.114.26101123CVE List
- Microsoft Office LTSC 2021affected: 16.0.1 before 16.0.14334.20974CVE List
- Microsoft Office LTSC 2024affected: 16.0.0 before 16.0.17932.21056CVE List
- Microsoft Office LTSC for Mac 2021affected: 16.0.1 before 16.114.26101123CVE List
- Microsoft Office LTSC for Mac 2024affected: 16.0.0 before 16.114.26101123CVE List
- Office Online Serveraffected: 16.0.0.0 before 16.0.10417.20228CVE List