CVE-2026-64918Medium· 6.5▾ SunlitInsufficiently protected credentials in Microsoft Office allows an unauthorized attacker to perform spoofing over a network.
▾ Sunlit zone — Low / medium · no exploitation signal
impact 35.8 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 9.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.5%
Insufficiently protected credentials in Microsoft Office allows an unauthorized attacker to perform spoofing over a network.
365_appsoffice_2016office_2019office_2021office_2024Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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CVE-2026-81397High· 7.8Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
CVE-2026-81398High· 7.8Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
CVE-2026-81399Medium· 5.5Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
CVE-2026-81400Medium· 5.5Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.