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PatchSiren cyber security CVE debrief

CVE-2026-80085 Microsoft CVE debrief

A heap-based buffer overflow vulnerability exists in Microsoft Office Word, potentially allowing an unauthorized attacker to execute code over a network. This high-severity vulnerability, with a CVSS score of 8.8, could enable attackers to execute code remotely. Defenders should assess exposure, especially in environments where Office documents are frequently opened from untrusted sources, and prioritize patching. The vulnerability's impact and specific version information require verification from official sources.

Vendor
Microsoft
Product
Microsoft 365 Apps for Enterprise
CVSS
HIGH 8.8
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 deployments, especially those in environments where Office documents are frequently opened from untrusted sources, should assess exposure and prioritize patching.

Why it matters

CVE-2026-80085 is a high-severity vulnerability in Microsoft Office Word that could allow code execution over a network. Defenders should prioritize patching vulnerable installations, especially in environments where Office documents are frequently opened from untrusted sources. The vulnerability's impact requires verification from official sources, and specific version information and exploitation details are currently unknown.

  • Potential code execution over a network
  • Elevation of privileges within Office applications
  • Data tampering or unauthorized access to sensitive information
  • Disruption of business operations due to potential exploitation

Technical summary

The CVE-2026-80085 vulnerability is a heap-based buffer overflow in Microsoft Office Word. It has a CVSS score of 8.8 and is classified as HIGH severity. The vulnerability could potentially allow an unauthorized attacker to execute code over a network.

Defensive priority

Defenders should prioritize patching vulnerable Microsoft Office Word installations, especially in environments where Office documents are frequently opened from untrusted sources.

Recommended defensive actions

  • Patch vulnerable Microsoft Office Word installations
  • Restrict opening Office documents from untrusted sources
  • Monitor for suspicious Office document activity

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score of 8.8 and weaknesses related to CWE-122. However, specific version information and exploitation details are not provided.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-80085 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-80085

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

  • CVE-2026-80085 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-80085

    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.