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CVE-2026-58644: Microsoft SharePoint Deserialization of Untrusted Data Vulnerability

Microsoft SharePoint · in CISA KEV since 2026-07-16

2026-07-16added to KEV
2026-07-19federal remediation due date
60.94%EPSS exploit probability (30 days) 99.1th percentile
9.8 CRITICALCVSS 3.1
Unknownknown ransomware use
2days from NVD publication to KEV

What it is

Microsoft SharePoint contains a deserialization of untrusted data vulnerability that allows an unauthorized attacker to execute code over a network.

Required action (CISA)

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

CWECWE-502
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD published2026-07-14 (Analyzed)

Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2026-58644.json · all KEV CVEs

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