CVE-2026-80087 Microsoft CVE debrief

Who should care

Defenders responsible for Microsoft Office installations should assess exposure and apply patches to prevent information disclosure. This includes reviewing and updating inventory of Microsoft Office installations, monitoring for suspicious activity related to Microsoft Office, and verifying and applying patches for Microsoft Office to prevent information disclosure.

Why it matters

A heap-based buffer overflow vulnerability in Microsoft Office could allow an unauthorized attacker to disclose information over a network. Defenders should assess exposure, apply patches, and monitor for suspicious activity.

• Defenders must verify and apply patches for Microsoft Office to prevent information disclosure.
• Inventory checks are necessary to identify affected Microsoft Office installations.
• Monitoring for suspicious activity related to Microsoft Office is recommended.

Technical summary

A heap-based buffer overflow vulnerability exists in Microsoft Office, which could allow an unauthorized attacker to disclose information over a network. The vulnerability has a CVSS score of 6.5 and a severity of MEDIUM. This vulnerability affects Microsoft Office installations, and defenders should assess exposure and apply patches to prevent information disclosure.

Defensive priority

Apply patches for Microsoft Office to prevent information disclosure

Recommended defensive actions

• Apply patches for Microsoft Office to prevent information disclosure
• Review and update inventory of Microsoft Office installations
• Monitor for suspicious activity related to Microsoft Office

Evidence notes

The CVE record and NVD vulnerability detail page provide information about the vulnerability, including its CVSS score and severity. Microsoft has provided a patch for this vulnerability.

Sources and 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.