CVE-2026-50522

Microsoft SharePoint Remote Code Execution Vulnerability

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

Affected

Microsoft · Microsoft SharePoint Enterprise Server 2016 · Microsoft SharePoint Server 2019 · Microsoft SharePoint Server Subscription Edition

CVSS v3.1 MICROSOFT

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

3.04% chance of exploitation in the next 30 days, 87th percentile

CISA KEV

added 2026-07-22

Published

2026-07-14

Updated

2026-10-08

Proof-of-concept exploits (4)

• 4minx/CVE-2026-5052243★ · 2026-08-15
• HORKimhab/CVE-2026-505220★ · 2026-08-24
• ChPratik/CVE-2026-505220★ · 2026-07-27
• darses/CVE-2026-505220★ · 2026-07-30

Security advisories

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50522

References

• CVE Record
• NVD entry

Related

• CVE-2024-32507
• CVE-2024-8682
• CVE-2026-14266
• CVE-2026-32475
• CVE-2026-48842
• CVE-2026-60137