CVE-2026-45455: CWE-125: Out-of-bounds Read in Microsoft Microsoft 365 Apps for Enterprise
CVE-2026-45455 is an out-of-bounds read vulnerability in Microsoft Office Excel within Microsoft 365 Apps for Enterprise. This flaw could allow an unauthorized attacker to disclose information over a network. The vulnerability has a low severity score and requires user interaction to be exploited. An official fix is available from Microsoft, and the product is a cloud service with vendor-managed remediation.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-45455) involves an out-of-bounds read in Microsoft Office Excel as part of Microsoft 365 Apps for Enterprise. The flaw allows unauthorized information disclosure over a network, requiring low attack complexity and user interaction, but no privileges. The vulnerability is tracked under CWE-125. Microsoft has published an official fix and manages remediation for this cloud-hosted service. No known exploits are reported in the wild.
Potential Impact
An attacker could exploit this vulnerability to read memory outside the intended bounds, potentially disclosing sensitive information over a network. The impact is limited to confidentiality loss without integrity or availability effects. The CVSS score of 3.3 reflects low severity, with attack vector local and requiring user interaction.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages the remediation server-side. Users and administrators should ensure that Microsoft 365 Apps for Enterprise is updated according to the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45455 to apply the fix.
CVE-2026-45455: CWE-125: Out-of-bounds Read in Microsoft Microsoft 365 Apps for Enterprise
Description
CVE-2026-45455 is an out-of-bounds read vulnerability in Microsoft Office Excel within Microsoft 365 Apps for Enterprise. This flaw could allow an unauthorized attacker to disclose information over a network. The vulnerability has a low severity score and requires user interaction to be exploited. An official fix is available from Microsoft, and the product is a cloud service with vendor-managed remediation.
CVSS v3.1
Score 3.3low
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-45455) involves an out-of-bounds read in Microsoft Office Excel as part of Microsoft 365 Apps for Enterprise. The flaw allows unauthorized information disclosure over a network, requiring low attack complexity and user interaction, but no privileges. The vulnerability is tracked under CWE-125. Microsoft has published an official fix and manages remediation for this cloud-hosted service. No known exploits are reported in the wild.
Potential Impact
An attacker could exploit this vulnerability to read memory outside the intended bounds, potentially disclosing sensitive information over a network. The impact is limited to confidentiality loss without integrity or availability effects. The CVSS score of 3.3 reflects low severity, with attack vector local and requiring user interaction.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages the remediation server-side. Users and administrators should ensure that Microsoft 365 Apps for Enterprise is updated according to the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45455 to apply the fix.
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: 6/9/2026, 5:26:47 PM
Last enriched: 6/9/2026, 10:27:49 PM
Last updated: 6/10/2026, 5:09:44 AM
Views: 2
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