CVE-2026-33115: Microsoft Office Word use after free code execution

CVE-2026-33115 · Severity: high · CVSS 8.4 · Published 2026-04-14

Microsoft Word, a widely used word processing application, contains a security flaw that could allow an attacker to run malicious code on a user's computer. If exploited, this could lead to a full system compromise, allowing unauthorized access to sensitive files, data theft, or the installation of malware. This affects various versions of Microsoft Office on both Windows and macOS.

Technologies: Microsoft 365 Apps for Enterprise, Microsoft Office LTSC 2021, Microsoft Office LTSC 2024, Microsoft Office LTSC for Mac 2021, Microsoft Office LTSC for Mac 2024. Vendors: Microsoft.

Quick answers

Is CVE-2026-33115 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-33115 being exploited in the wild.
How severe is CVE-2026-33115?
High severity, with a CVSS score of 8.4, published 14 April 2026.
Which products and versions are affected?
Microsoft 365 Apps for Enterprise 16.0.1 and later versions prior to security updates; Microsoft Office LTSC 2021 16.0.1 and later versions prior to security updates; Microsoft Office LTSC 2024 16.0.0 and later versions prior to security updates; Microsoft Office LTSC for Mac 2021 versions prior to 16.108.26041219; and 1 more.
Is there a fix for CVE-2026-33115?
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-2026-33115 attacked?
It is attacked with local access, in a network appliance.
Am I affected by CVE-2026-33115?
Check whether you run Microsoft 365 Apps for Enterprise, Microsoft Office LTSC 2021, Microsoft Office LTSC 2024 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 (UAF) vulnerability exists in Microsoft Office Word (CWE-416). The flaw is triggered when the application continues to use a pointer after it has been freed, potentially allowing an attacker to corrupt memory and gain control of the execution flow. While the attack vector is classified as local, an attacker who successfully exploits this can achieve full code execution with the privileges of the current user. The vulnerability affects Microsoft 365 Apps, Office LTSC 2021, and Office LTSC 2024 on both Windows and macOS platforms. Microsoft has released security updates to address this issue.

Affected products

  • Microsoft 365 Apps for Enterprise 16.0.1 and later versions prior to security updates
  • Microsoft Office LTSC 2021 16.0.1 and later versions prior to security updates
  • Microsoft Office LTSC 2024 16.0.0 and later versions prior to security updates
  • Microsoft Office LTSC for Mac 2021 versions prior to 16.108.26041219
  • Microsoft Office LTSC for Mac 2024 versions prior to 16.108.26041219

Timeline

  • 2026-04-14: disclosed
  • 2026-04-14: advisory: Initial advisory published by Microsoft

References

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