CVE-2026-66806

Off-by-one error in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

Score

CVSS 3.1 5.5 Medium

Status

Analyzed - secure@microsoft.com

Published

2026-08-11

Last modified

2026-10-28

Weaknesses

CWE-125, CWE-193

Affected products

• 365 Apps (Microsoft)
• Office 2019 (Microsoft)
• Office 2021 (Microsoft)
• Office 2024 (Microsoft)
• Word (Microsoft)
• Word 2016 (Microsoft)

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66806