CVSS 3.1
8.8 highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HCVE-2026-118712 Microsoft Office Excel Remote Code Execution Vulnerability
High (8.8) in microsoft. EPSS 0.9% estimated probability of exploitation activity in the next 30 days.
Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
Severity
- EPSS
- 0.9% estimated probability of exploitation activity in the next 30 days; 62nd percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
- CISA's assessment (SSVC)
- Exploitation: none · Automatable: no · Technical impact: total, assessed 2026-11-10. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
- CWE
- CWE-191 Integer Underflow (Wrap or Wraparound)
- Published
- Modified
- Assigned by
- microsoft (CNA)
- NVD analysis
- Awaiting analysis
- Record from
- the NVD, synced
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Affected
- microsoft:microsoft 365 apps for enterprise
- microsoft:microsoft office 365 for mac
- microsoft:microsoft office ltsc 2021
- microsoft:microsoft office ltsc 2024
- microsoft:microsoft office ltsc for mac 2021
- microsoft:microsoft office ltsc for mac 2024
- microsoft:office online server
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| Microsoft 365 Apps for Enterprise | from 16.0.1 before https://aka.ms/OfficeSecurityReleases |
| Microsoft Office 365 for Mac | from 1.0.0 before 16.115.26110837 |
| Microsoft Office LTSC 2021 | from 16.0.1 before 16.0.14334.21048 |
| Microsoft Office LTSC 2024 | from 16.0.0 before 16.0.17932.21140 |
| Microsoft Office LTSC for Mac 2021 | from 16.0.1 before 16.115.26110837 |
| Microsoft Office LTSC for Mac 2024 | from 16.0.0 before 16.115.26110837 |
| Microsoft Office Online Server | from 16.0.0.0 before 16.0.10417.20236 |