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
CVE-2026-55054 is a CWE-125 out-of-bounds read vulnerability in Microsoft Office Excel component of Microsoft 365 Apps for Enterprise. It allows an unauthorized attacker to read memory beyond the intended bounds, potentially disclosing sensitive information over a network. The vulnerability is rated medium severity with a CVSS 3.1 base score of 6.5 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N). Microsoft has released an official fix for this issue. The affected version explicitly identified is 16.0.1. The product is cloud-hosted, and Microsoft manages the remediation process server-side.
Potential Impact
An attacker can exploit this vulnerability to read sensitive information from memory remotely without privileges, potentially leading to information disclosure. There is no impact on integrity or availability. The vulnerability requires user interaction and network access but no privileges.
Mitigation Recommendations
An official fix is available from Microsoft. Users of Microsoft 365 Apps for Enterprise version 16.0.1 should apply the update as per the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55054. Since this is a cloud-hosted service, Microsoft manages remediation server-side. Users should verify that their environment is updated accordingly.
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
CVE-2026-55054 is a CWE-125 out-of-bounds read vulnerability in Microsoft Office Excel component of Microsoft 365 Apps for Enterprise. It allows an unauthorized attacker to read memory beyond the intended bounds, potentially disclosing sensitive information over a network. The vulnerability is rated medium severity with a CVSS 3.1 base score of 6.5 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N). Microsoft has released an official fix for this issue. The affected version explicitly identified is 16.0.1. The product is cloud-hosted, and Microsoft manages the remediation process server-side.
Potential Impact
An attacker can exploit this vulnerability to read sensitive information from memory remotely without privileges, potentially leading to information disclosure. There is no impact on integrity or availability. The vulnerability requires user interaction and network access but no privileges.
Mitigation Recommendations
An official fix is available from Microsoft. Users of Microsoft 365 Apps for Enterprise version 16.0.1 should apply the update as per the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55054. Since this is a cloud-hosted service, Microsoft manages remediation server-side. Users should verify that their environment is updated accordingly.
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: 08/13/2026, 15:36:45 UTC
Last updated: 08/27/2026, 22:52:12 UTC
Views: 65
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