CVE-2026-55121: CWE-125: Out-of-bounds Read in Microsoft Microsoft 365 Apps for Enterprise
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.
AI Analysis
Technical Summary
This vulnerability (CWE-125) involves an out-of-bounds read in Microsoft 365 Apps for Enterprise, which could allow an unauthorized local attacker to read memory outside the intended bounds, potentially disclosing sensitive information. The issue affects version 16.0.1. Microsoft has released an official fix and manages remediation for this cloud service. No known exploits are reported in the wild.
Potential Impact
An unauthorized local attacker can exploit this out-of-bounds read vulnerability to disclose information from memory, which may lead to information leakage. The impact does not include confidentiality or integrity loss but results in availability impact as per the CVSS vector. No known active exploitation has been reported.
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 refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55121 for detailed patching and update instructions.
CVE-2026-55121: CWE-125: Out-of-bounds Read in Microsoft Microsoft 365 Apps for Enterprise
Description
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.
CVSS v3.1
Score 5.5medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-125) involves an out-of-bounds read in Microsoft 365 Apps for Enterprise, which could allow an unauthorized local attacker to read memory outside the intended bounds, potentially disclosing sensitive information. The issue affects version 16.0.1. Microsoft has released an official fix and manages remediation for this cloud service. No known exploits are reported in the wild.
Potential Impact
An unauthorized local attacker can exploit this out-of-bounds read vulnerability to disclose information from memory, which may lead to information leakage. The impact does not include confidentiality or integrity loss but results in availability impact as per the CVSS vector. No known active exploitation has been reported.
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 refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55121 for detailed patching and update instructions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-16T15:03:49.680Z
- 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-2026-55121","vendor":"Microsoft"}]
Threat ID: 6a5676b568715ace43f0ab01
Added to database: 07/14/2026, 17:49:41 UTC
Last enriched: 07/14/2026, 19:18:54 UTC
Last updated: 07/15/2026, 01:27:22 UTC
Views: 2
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