CVE-2026-55124 Details
Description
Improper validation of specified type of input in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
A vulnerability exists in Microsoft Office Word due to improper validation of certain input types. This flaw allows an unauthorized attacker to locally disclose information. The issue affects multiple versions of Microsoft Office, including Word 2016, Word 2019, and various editions of Office LTSC for both Mac and Windows. SharePoint Server products are also impacted.
Users can download the security update for this vulnerability through the Microsoft Update Catalog. Specific update details can be found in the Microsoft Office Security Update Release Notes.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 14, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55124 | [email protected] | Vendor AdvisoryPatch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1287 | Improper Validation of Specified Type of Input | [email protected] |
| CWE-20 | Improper Input Validation | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft 365 apps | All versions |
CPE
Remediation
| |
| microsoft microsoft 365 | All versions |
CPE
Remediation
| |
| microsoft office 2019 | All versions |
CPE
Remediation
| |
| microsoft office 2021 | All versions |
CPE
Remediation
| |
| microsoft office 2024 | All versions |
CPE
Remediation
| |
| microsoft office online server | < 16.0.10417.20175 |
CPE
Remediation
| |
| microsoft sharepoint server | < 16.0.19725.20434 2016 2019 |
CPE
Remediation
| |
| microsoft word | 2016 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 16, 2026 | Initial Analysis | [email protected] |
| Jul 14, 2026 | CVE Modified | CISA-ADP |
| Jul 14, 2026 | New CVE Received | [email protected] |