Exploited CVEs / Microsoft / CVE-2026-50522
CVE-2026-50522
Updated July 22, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Actively exploited Microsoft SharePoint vulnerability. Added to the CISA KEV catalog 2026-07-22.
All about CVE-2026-50522: the Senserva AI read, the CISA required action and deadline, the official fix, what the press says about it, and the questions admins ask.
Microsoft SharePoint Deserialization of Untrusted Data Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2026-07-25; treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Microsoft Security Update Guide (MSRC), linked below.
Risk summary
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Senserva AI Opinion for CVE-2026-50522
CVE-2026-50522 is a Critical (CVSS 9.8) remote code execution flaw spanning three SharePoint on-premises versions: Enterprise Server 2016, Server 2019, and Subscription Edition. The near-maximum score with no required interaction means an attacker who reaches your SharePoint endpoint can run code on the server hosting your document libraries and site content. It is not yet in CISA KEV and has no known ransomware use, but internet-facing SharePoint has historically been a fast-moving target once patches reveal the bug.
Do this: Identify every on-premises SharePoint 2016, 2019, and Subscription Edition instance, prioritize any that are internet-facing, and apply the Microsoft security update immediately.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-50522
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2026-50522
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
What the press says about CVE-2026-50522
Trusted-source coverage, pulled live from their own feeds.
CISA required action
Federal (BOD 22-01) remediation due date: 2026-07-25.
Official fix for CVE-2026-50522
The authoritative fix and affected-version list are published by the vendor. Find the SharePoint advisory on Microsoft Security Update Guide (MSRC).
Common questions about CVE-2026-50522
Is CVE-2026-50522 actively exploited?
Yes. CVE-2026-50522 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2026-07-22, which means exploitation in the wild has been confirmed, not predicted.
What is the CISA deadline and required action for CVE-2026-50522?
CISA set the federal (BOD 22-01) remediation due date at 2026-07-25.
What fixes CVE-2026-50522?
The authoritative fix is in the vendor advisory: see Microsoft Security Update Guide (MSRC) for the patched SharePoint versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2026-50522?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2026-50522's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed three times a day (5 AM, 12:30 PM, and 7 PM US Central).
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Authoritative references
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