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CVE-2026-44819 Microsoft CVE debrief

CVE-2026-44819 is a high-severity vulnerability in Microsoft Office that allows an unauthorized attacker to execute code locally. The vulnerability has a CVSS v3.1 score of 7.8 and is classified as HIGH. It was published on June 9, 2026, and last modified on June 11, 2026.

Vendor
Microsoft
Product
Microsoft 365 Apps for Enterprise
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-19
Advisory published
2026-06-09
Advisory updated
2026-06-19

Who should care

Administrators and users of Microsoft Office, particularly those using Microsoft 365 Apps, Office 2016, Office 2019, Office 2021, and Office 2024, as well as SharePoint Server.

Technical summary

The vulnerability is a heap-based buffer overflow in Microsoft Office. An attacker could exploit this vulnerability by tricking a user into opening a specially crafted file, allowing the attacker to execute code locally.

Defensive priority

High

Recommended defensive actions

  • Apply patches and updates from Microsoft as soon as possible.
  • Use secure practices when opening files from unknown sources.
  • Consider implementing additional security measures, such as network segmentation and monitoring.

Evidence notes

The vulnerability is confirmed by Microsoft and has been analyzed by the National Vulnerability Database (NVD).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-44819 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-44819

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-44819 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-44819

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental 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.