CVSS v3
9.8
CRITICAL
EPSS Score
1.3%
exploit probability
CISA KEV
Yes
known exploited
Exploitation
—
SSVC status
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
Yes. CVE-2026-58644 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 7/19/2026.
CVE-2026-58644 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string 3.1.
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