CRITICAL CISA KEV

CVE-2026-58644

CVSS v3

9.8

CRITICAL

EPSS Score

1.3 %

exploit probability

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

Description

Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.

CISA Known Exploited Vulnerability

Date Added: 2026-07-16
Patch Due Date: 2026-07-19
Ransomware Use: Unknown

Technical details

CVSS v3 Vector: 3.1
Published: 2026-07-14
Last Modified: 2026-07-15
CERT-FR Advisory: CERTFR-2026-ALE-008
CERT-FR Link: CERTFR-2026-ALE-008

Frequently asked questions

What is CVE-2026-58644?

Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.

Is CVE-2026-58644 actively exploited?

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 2026-07-19.

What is the CVSS score for CVE-2026-58644?

CVE-2026-58644 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string 3.1.

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