CVE-2026-55054: 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 over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-55054) involves an out-of-bounds read (CWE-125) in Microsoft Office Excel as part of Microsoft 365 Apps for Enterprise. It enables an unauthorized attacker to read memory outside the intended bounds, potentially disclosing sensitive information over a network. The CVSS 3.1 vector indicates the attack can be performed remotely without privileges but requires user interaction. Microsoft has published an official fix and manages remediation for this cloud-hosted service.
Potential Impact
Successful exploitation can lead to unauthorized disclosure of information, impacting confidentiality. There is no indication of integrity or availability impact. The vulnerability can be exploited remotely with low attack complexity but requires user interaction.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud service, Microsoft manages remediation server-side. Users and administrators should ensure their Microsoft 365 Apps for Enterprise are updated according to the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55054.
CVE-2026-55054: 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 over a network.
CVSS v3.1
Score 6.5medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-55054) involves an out-of-bounds read (CWE-125) in Microsoft Office Excel as part of Microsoft 365 Apps for Enterprise. It enables an unauthorized attacker to read memory outside the intended bounds, potentially disclosing sensitive information over a network. The CVSS 3.1 vector indicates the attack can be performed remotely without privileges but requires user interaction. Microsoft has published an official fix and manages remediation for this cloud-hosted service.
Potential Impact
Successful exploitation can lead to unauthorized disclosure of information, impacting confidentiality. There is no indication of integrity or availability impact. The vulnerability can be exploited remotely with low attack complexity but requires user interaction.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud service, Microsoft manages remediation server-side. Users and administrators should ensure their Microsoft 365 Apps for Enterprise are updated according to the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55054.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-16T14:13:49.836Z
- 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-2026-55054","vendor":"Microsoft"}]
Threat ID: 6a5676b368715ace43f0aaa9
Added to database: 07/14/2026, 17:49:39 UTC
Last enriched: 07/14/2026, 19:19:56 UTC
Last updated: 07/15/2026, 01:27:29 UTC
Views: 3
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