CVE-2026-55032: Microsoft Office Word use after free code execution

CVE-2026-55032 · Severity: high · CVSS 7.8 · Published 2026-07-14

A vulnerability in Microsoft Word could allow an attacker to run malicious code on a user's computer. This typically occurs if a user is tricked into opening a specially crafted document. If successful, the attacker could gain the same permissions as the user, potentially leading to data theft, unauthorized changes, or full system compromise.

Technologies: Microsoft 365 Apps for Enterprise, Microsoft Office 2019, Microsoft Office 365 for Mac, Microsoft Office LTSC 2021, Microsoft Office LTSC 2024, Microsoft SharePoint Server Subscription Edition. Vendors: Microsoft.

Quick answers

Is CVE-2026-55032 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-55032 being exploited in the wild.
How severe is CVE-2026-55032?
High severity, with a CVSS score of 7.8, published 14 July 2026.
Which products and versions are affected?
Microsoft 365 Apps for Enterprise 16.0.1 up to latest security release; Microsoft Office 2019 19.0.0 up to latest security release; Microsoft Office 365 for Mac 1.0.0 to 16.111.26071215; Microsoft Office LTSC 2021 16.0.1 up to latest security release; and 2 more.
Is there a fix for CVE-2026-55032?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-55032 attacked?
It is attacked with local access, in a network appliance.
Am I affected by CVE-2026-55032?
Check whether you run Microsoft 365 Apps for Enterprise, Microsoft Office 2019, Microsoft Office 365 for Mac or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A use-after-free (CWE-416) vulnerability exists in Microsoft Office Word due to improper memory management. An attacker can exploit this by convincing a user to open a maliciously crafted file, triggering the execution of arbitrary code in the context of the current user. The attack vector is local, but it requires user interaction (UI:R) to open the document. The vulnerability affects multiple versions of Microsoft Office, including Microsoft 365 Apps, Office LTSC, and SharePoint Server. Microsoft has released security updates to address this issue.

Affected products

  • Microsoft Microsoft 365 Apps for Enterprise 16.0.1 up to latest security release
  • Microsoft Microsoft Office 2019 19.0.0 up to latest security release
  • Microsoft Microsoft Office 365 for Mac 1.0.0 to 16.111.26071215
  • Microsoft Microsoft Office LTSC 2021 16.0.1 up to latest security release
  • Microsoft Microsoft Office LTSC 2024 16.0.0 up to latest security release
  • Microsoft Microsoft SharePoint Server Subscription Edition Affected

Timeline

  • 2026-07-14: disclosed: Initial publication of CVE-2026-55032 by Microsoft
  • 2026-07-14: advisory: NVD entry created and updated with Microsoft CNA data

References

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