---
title: "Microsoft SharePoint — CVE-2026-58644"
description: "An unsafe deserialisation flaw affects Microsoft SharePoint. Apply the vendor’s patch. It is being actively exploited: patch now."
canonical: https://inyourgeek.com/en/failles-de-securite/2026-07-16-cve-2026-58644
type: faille-de-securite
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2026-07-16
dateModified: 2026-07-16
---
# Microsoft SharePoint — CVE-2026-58644

An unsafe deserialisation flaw affects Microsoft SharePoint. Apply the vendor’s patch. It is being actively exploited: patch now.

## What to do

Check the vendor advisory for the fixed version. This flaw is being actively exploited: patch now.

| Fact | Value |
| --- | --- |
| Ecosystem | Application software |
| Class | Unsafe deserialisation |
| CVE | CVE-2026-58644 |
| Published on | July 16, 2026 |
| Severity | Critical |

## Sources

- [CISA KEV — CVE-2026-58644](https://www.cisa.gov/known-exploited-vulnerabilities-catalog) — CISA Known Exploited Vulnerabilities
- [NVD — CVE-2026-58644](https://nvd.nist.gov/vuln/detail/CVE-2026-58644) — NVD

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