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CVE-2026-50314 Microsoft CVE debrief

CVE-2026-50314 is a high-severity 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. It was published on 2026-07-14T18:17:29.863Z and last modified on 2026-07-16T19:48:31.643Z. This use-after-free issue in Microsoft Office can be exploited by attackers to execute malicious code on affected systems, potentially leading to unauthorized access and data breaches. Users of Microsoft Office, particularly those using Microsoft 365 Apps, Office 2016, Office 2019, Office 2021, and Office 2024, should be aware of this vulnerability and take necessary precautions to mitigate the risk.

Vendor
Microsoft
Product
Microsoft 365 Apps for Enterprise
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-16
Advisory published
2026-07-14
Advisory updated
2026-07-16

Who should care

Users of Microsoft Office, particularly those using Microsoft 365 Apps, Office 2016, Office 2019, Office 2021, and Office 2024, should be aware of this vulnerability and take necessary precautions. This includes IT administrators responsible for managing Microsoft Office deployments, security teams monitoring for potential exploitation attempts, and end-users who may be affected by the vulnerability.

Technical summary

The vulnerability is a use-after-free issue in Microsoft Office, which allows an unauthorized attacker to execute code locally. The CVSS vector is CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. The weakness is classified as CWE-416. This type of vulnerability occurs when a program attempts to use memory after it has been freed, which can lead to crashes, data corruption, or code execution. In the context of Microsoft Office, this vulnerability can be particularly dangerous as it allows attackers to execute arbitrary code, potentially leading to a complete compromise of the affected system.

Defensive priority

High

Recommended defensive actions

  • Apply patches or updates provided by Microsoft to vulnerable versions of Microsoft Office.
  • Implement compensating controls, such as monitoring and exception tracking, to detect potential exploitation attempts.
  • Conduct inventory checks to ensure all Microsoft Office installations are up-to-date and patched.
  • Review and update incident response plans to include procedures for handling potential exploitation of this vulnerability.
  • Verify that security monitoring and logging are in place to detect and respond to potential attacks.

Evidence notes

The CVE record was published on 2026-07-14T18:17:29.863Z and was last modified on 2026-07-16T19:48:31.643Z. The NVD entry is currently Analyzed. The vulnerability affects multiple versions of Microsoft Office, including Microsoft 365 Apps, Office 2016, Office 2019, Office 2021, and Office 2024. However, the specific details about the affected versions and the patching information should be verified with Microsoft's official advisories.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T18:17:29.863Z and has not been modified since then. The NVD entry is currently Analyzed.