CVE-2026-45455: CWE-125: Out-of-bounds Read in Microsoft Microsoft 365 Apps for Enterprise
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
AI Analysis
Technical Summary
CVE-2026-45455 is an out-of-bounds read vulnerability (CWE-125) in Microsoft Office Excel as part of Microsoft 365 Apps for Enterprise. The vulnerability allows unauthorized local attackers to read memory outside the intended bounds, potentially disclosing information. The CVSS 3.1 base score is 3.3, reflecting low severity with local attack vector, low complexity, no privileges required, and user interaction needed. The vulnerability affects version 16.0.1. Microsoft has issued an official fix and manages remediation for this cloud-hosted service.
Potential Impact
The vulnerability could lead to unauthorized local disclosure of information due to an out-of-bounds read in Excel. There is no indication of integrity or availability impact. Exploitation requires local access and user interaction. No known exploits are reported in the wild.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud service, Microsoft manages the remediation server-side. Users and administrators should ensure their Microsoft 365 Apps for Enterprise are updated according to Microsoft's guidance at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45455.
CVE-2026-45455: CWE-125: Out-of-bounds Read in Microsoft Microsoft 365 Apps for Enterprise
Description
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
CVSS v3.1
Score 3.3low
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-45455 is an out-of-bounds read vulnerability (CWE-125) in Microsoft Office Excel as part of Microsoft 365 Apps for Enterprise. The vulnerability allows unauthorized local attackers to read memory outside the intended bounds, potentially disclosing information. The CVSS 3.1 base score is 3.3, reflecting low severity with local attack vector, low complexity, no privileges required, and user interaction needed. The vulnerability affects version 16.0.1. Microsoft has issued an official fix and manages remediation for this cloud-hosted service.
Potential Impact
The vulnerability could lead to unauthorized local disclosure of information due to an out-of-bounds read in Excel. There is no indication of integrity or availability impact. Exploitation requires local access and user interaction. No known exploits are reported in the wild.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud service, Microsoft manages the remediation server-side. Users and administrators should ensure their Microsoft 365 Apps for Enterprise are updated according to Microsoft's guidance at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45455.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-05-12T16:06:43.097Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45455","vendor":"Microsoft"}]
Threat ID: 6a284cd78dd33fbd85664bfe
Added to database: 06/09/2026, 17:26:47 UTC
Last enriched: 07/29/2026, 21:54:22 UTC
Last updated: 07/31/2026, 21:26:44 UTC
Views: 59
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