# CVE-2026-111307

Heap overflow in Microsoft Word allowing remote code execution via crafted documents.

- Page: https://www.vulneraibility.com/cve/CVE-2026-111307
- CVSS: 8.8
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 0.95% (percentile 61.7)
- CISA SSVC: exploitation none, automatable no, technical impact total (assessed 2026-11-10)
- Weakness: CWE-122
- Published: 2026-11-10

## Affected versions

- Microsoft Microsoft 365 Apps for Enterprise: affected >= 16.0.1 and < https://aka.ms/OfficeSecurityReleases
- Microsoft Microsoft Office 365 for Mac: affected >= 1.0.0 and < 16.115.26110837
- Microsoft Microsoft Office LTSC 2021: affected >= 16.0.1 and < 16.0.14334.21048
- Microsoft Microsoft Office LTSC 2024: affected >= 16.0.0 and < 16.0.17932.21140
- Microsoft Microsoft Office LTSC for Mac 2021: affected >= 16.0.1 and < 16.115.26110837
- Microsoft Microsoft Office LTSC for Mac 2024: affected >= 16.0.0 and < 16.115.26110837

A version outside these ranges is not a statement that it is unaffected.

## Impact

Remote code execution over network via crafted Word document; attacker can run arbitrary code, install malware, escalate access as the user.

## Action

Immediate action required

## Recommendation

Apply Microsoft's security update for CVE-2026-111307 immediately

## References

- [patch] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-111307

---
Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.