CVE-2026-54988 Details
Description
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
A vulnerability allowing out-of-bounds read has been identified in Microsoft Office Excel. This issue allows an unauthorized attacker to locally disclose information by reading small portions of heap memory. The vulnerability affects multiple versions of Excel, including Excel 2016 (both 32-bit and 64-bit editions), Office LTSC for Mac 2024, Office LTSC 2024 for 32-bit and 64-bit editions, Office LTSC 2021 for 32-bit and 64-bit editions, Office LTSC for Mac 2021, Microsoft 365 Apps for Enterprise for 32-bit and 64-bit systems, Office 2019 for 32-bit and 64-bit editions, and Office Online Server.
Users can download the security update for this vulnerability through the Microsoft Update Catalog. For Office LTSC for Mac 2024 and Office LTSC for Mac 2021, the security update is also available via the Mac App Store.
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-2026-54988 | [email protected] | PatchVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft 365 apps | All versions |
CPE
Remediation
| |
| microsoft excel | 2016 |
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
| |
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] |