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PatchSiren cyber security CVE debrief

CVE-2026-44822 Microsoft CVE debrief

CVE-2026-44822 is a high-severity vulnerability in Microsoft Office Excel that can be exploited by an unauthorized attacker to disclose sensitive information over a network. The vulnerability has a CVSS score of 8.2 and is classified as CWE-125.

Vendor
Microsoft
Product
Microsoft 365 Apps for Enterprise
CVSS
HIGH 8.2
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

Users of Microsoft Office Excel, particularly those using vulnerable versions, should apply patches or mitigations to prevent exploitation.

Technical summary

The vulnerability is an out-of-bounds read issue in Microsoft Office Excel, which can be exploited by an attacker to disclose information over a network. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.

Defensive priority

High

Recommended defensive actions

  • Apply patches or updates provided by Microsoft to vulnerable versions of Microsoft Office Excel.
  • Refer to the vendor advisory at resourceLinkAnnotations with id 'ref-4' for additional mitigation or remediation guidance.

Evidence notes

The CVE record and NVD detail pages provide additional information about the vulnerability, including affected products and versions.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-44822 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-44822

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

  • CVE-2026-44822 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-44822

    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.