Critical SharePoint RCE CVE-2026-50522 Under Active Exploitation After Public PoC

A third SharePoint Server flaw patched by Microsoft as part of its Patch Tuesday update for July 2026 has come under active exploitation, per watchTowr.

The vulnerability in question is CVE-2026-50522 (CVSS score: 9.8), a critical deserialization of untrusted data in Microsoft Office SharePoint that could allow an unauthorized attacker to execute code over a network. Microsoft credited DEVCORE

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id: 2146
uid: KIUY1
insdate: 2026-07-21 15:10:05
title: Critical SharePoint RCE CVE-2026-50522 Under Active Exploitation After Public PoC
additional: A third SharePoint Server flaw patched by Microsoft as part of its Patch Tuesday update for July 2026 has come under active exploitation, per watchTowr.

The vulnerability in question is CVE-2026-50522 (CVSS score: 9.8), a critical deserialization of untrusted data in Microsoft Office SharePoint that could allow an unauthorized attacker to execute code over a network. Microsoft credited DEVCORE
category: Cybersecurity
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