PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-80090 Microsoft CVE debrief

Microsoft Office Word vulnerability allows unauthorized information disclosure over a network via an out-of-bounds read. This medium-severity vulnerability requires defenders to assess exposure and apply patches to prevent potential information disclosure. The vulnerability has a CVSS score of 6.5 and affects Microsoft Office Word installations, particularly in networked environments. Defenders should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Vendor
Microsoft
Product
Microsoft 365 Apps for Enterprise
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-17
Advisory published
2026-09-08
Advisory updated
2026-09-17

Who should care

Defenders responsible for Microsoft Office Word installations, particularly in networked environments, should assess exposure and apply patches or updates.

Why it matters

CVE-2026-80090 is a medium-severity vulnerability in Microsoft Office Word that requires defenders to assess exposure and apply patches to prevent potential information disclosure.

  • Potential information disclosure over the network
  • Need to verify affected versions and apply patches
  • Possible impact on confidentiality

Technical summary

CVE-2026-80090 is an out-of-bounds read vulnerability in Microsoft Office Word that allows an unauthorized attacker to disclose information over a network. The vulnerability has a CVSS score of 6.5 and is considered medium severity. It affects Microsoft Office Word installations, particularly in networked environments, requiring defenders to assess exposure and apply patches or updates provided by Microsoft. The official CVE Program record and NVD detail page offer source-provided CVE metadata and source-specific vulnerability assessment.

Defensive priority

Medium priority for defenders to assess exposure and apply patches

Recommended defensive actions

  • Assess exposure of Microsoft Office Word installations to this vulnerability
  • Apply patches or updates provided by Microsoft
  • Monitor for potential information disclosure attempts

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but specific version information and exploitation details are not provided. The vulnerability has not been modified since its publication on 2026-09-08T18:20:51.540Z. The official CVE Program record and NVD detail page offer source-provided CVE metadata and source-specific vulnerability assessment. Defenders should verify affected versions and apply patches or updates provided by Microsoft.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-80090 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-80090

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

  • CVE-2026-80090 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-80090

    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.