CVE-2026-50467 Microsoft CVE debrief

Who should care

Organizations using Microsoft Office, particularly versions 2016, 2019, 2021, and 2024, should prioritize patching to prevent local code execution. This includes operators, platform administrators, vulnerability management teams, and security teams who need to ensure that their environments are protected against this high-severity vulnerability. Regularly reviewing and updating software configurations is also crucial to prevent exploitation.

Technical summary

CVE-2026-50467 is a high-severity Use after free vulnerability in Microsoft Office, allowing unauthorized attackers to execute code locally. The vulnerability has a CVSS score of 7.8 and is classified as HIGH. Affected products include Microsoft 365 Apps, Office 2016, Office 2019, Office 2021, and Office 2024 across various platforms. The vulnerability can be mitigated by applying patches from Microsoft for affected Office versions. It is essential to inventory and update vulnerable Office installations and implement compensating controls such as monitoring for suspicious activity.

Defensive priority

High priority due to high CVSS score and potential for local code execution. Organizations should apply patches from Microsoft for affected Office versions, inventory and update vulnerable Office installations, and implement compensating controls such as monitoring for suspicious activity.

Recommended defensive actions

• Apply patches from Microsoft for affected Office versions
• Inventory and update vulnerable Office installations
• Implement compensating controls such as monitoring for suspicious activity
• Enforce least privilege access to Office applications
• Regularly review and update software configurations

Evidence notes

The CVE record and NVD details provide evidence of the vulnerability's existence and its high severity. Microsoft has provided a patch and advisory for the vulnerability. The NVD entry is currently Analyzed, and there are no known instances of exploitation. However, defenders should verify the affected scope, severity, and vendor guidance to ensure proper mitigation. The evidence is limited to the CVE record, NVD details, and Microsoft's mitigation and patch information.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.