CVE-2026-88178
Microsoft Microsoft 365 Apps for Enterprise
- Microsoft Microsoft 365 Apps for Enterprise
- Critical
- CVSS 9.8
- EPSS 0.95%
- Fixed version listed
What to do
Fixed version listed
Affected products
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft Microsoft 365 Apps for Enterprise (32-bit Systems, x64-based Systems) | from 16.0.1, before https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| Microsoft Microsoft Office 365 for Mac | from 1.0.0, before 16.114.26101123 | 16.114.26101123 |
| Microsoft Microsoft Office LTSC 2021 (32-bit Systems, x64-based Systems) | from 16.0.1, before 16.0.14334.20974 | 16.0.14334.20974 |
| Microsoft Microsoft Office LTSC 2024 (32-bit Systems, x64-based Systems) | from 16.0.0, before 16.0.17932.21056 | 16.0.17932.21056 |
| Microsoft Microsoft Office LTSC for Mac 2021 | from 16.0.1, before 16.114.26101123 | 16.114.26101123 |
| Microsoft Microsoft Office LTSC for Mac 2024 | from 16.0.0, before 16.114.26101123 | 16.114.26101123 |
Advisories and fixes
- Vendor advisory msrc.microsoft.com
Scores and signals
- Exploitation
- No known exploitation
- Severity
- Critical, CVSS 9.8 (v3.1, scored by microsoft)
- EPSS
- 0.95% chance of exploitation in the next 30 days (EPSS from FIRST, as of Oct 24, 2026)
- CISA's SSVC decision points
- Exploitation: none. Automatable: yes. Technical impact: total. As of Oct 8, 2026.
- Weakness
- CWE-416: Use After Free
- Vendor
- Microsoft, Microsoft 365 Apps for Enterprise
Timeline
- First listed as critical by cve.now. Affected and fixed versions come from the CVE record, once one is published.