CVE-2026-55026Important
Microsoft Office Information Disclosure Vulnerability
Assessment
Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to disclose information locally.
- Severity
- Important
- CVSS base score
- 6.2CVSS:3.1/
AV:L/ AC:L/ PR:N/ UI:N/ S:U/ C:H/ I:N/ A:N/ E:U/ RL:O/ RC:C - Impact
- Information Disclosure
- EPSS, next 30 days
- 0.4%Higher than 36.5% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
- Exploitability
- Exploitation Less Likely
- Publicly disclosed
- No
- Customer action
- Required: apply the update
- Component
- Microsoft Office
- Weakness
- CWE-190: Integer Overflow or Wraparound
- Issued by
- Microsoft
- Published
- 14 Jul 2026 · July 2026
- Last revised
- 14 Jul 2026
Updates that fix it
6 KBs| KB | Type | Restart | Applies to | Other CVEs |
|---|---|---|---|---|
| KB5002882 | Security Update | — | Microsoft SharePoint Server Subscription Edition | All CVEs in KB5002882 |
| KB5002883 | Security Update | — | Microsoft SharePoint Server 2019 | All CVEs in KB5002883 |
| KB5002885 | Security Update | — | Microsoft SharePoint Server 2019 | All CVEs in KB5002885 |
| KB5002887 | Security Update | — | Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition) | All CVEs in KB5002887 |
| KB5002891 | Security Update | — | Microsoft SharePoint Enterprise Server 2016 | All CVEs in KB5002891 |
| KB5002892 | Security Update | — | Microsoft SharePoint Enterprise Server 2016 | All CVEs in KB5002892 |
Affected products
Microsoft Office16 affected products
- Microsoft 365 Apps for Enterprise for 32-bit Systems
- Microsoft 365 Apps for Enterprise for 64-bit Systems
- Microsoft Office 2016 (32-bit edition)
- Microsoft Office 2016 (64-bit edition)
- Microsoft Office 2019 for 32-bit editions
- Microsoft Office 2019 for 64-bit editions
- Microsoft Office 365 for Mac
- Microsoft Office LTSC 2021 for 32-bit editions
- Microsoft Office LTSC 2021 for 64-bit editions
- Microsoft Office LTSC 2024 for 32-bit editions
- Microsoft Office LTSC 2024 for 64-bit editions
- Microsoft Office LTSC for Mac 2021
- Microsoft Office LTSC for Mac 2024
- Microsoft SharePoint Enterprise Server 2016
- Microsoft SharePoint Server 2019
- Microsoft SharePoint Server Subscription Edition