CVE-2026-50522Critical· 9.8▾ Hadal⚠ Exploited in the wildPoC availableDeserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
▾ Hadal zone — Critical and actively exploited (CISA KEV / 0day)
impact 53.9 · likelihood 0.6 · exploitation 25
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Federal remediation due Jul 25, 2026
85%
85% → 85%
Last analysed / modified upstream
5 GitHub repos (last check)
Added to the CISA catalog on Jul 22, 2026. Federal remediation due Jul 25, 2026. View catalog ↗
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
sharepoint_enterprise_server_2016 >= 16.0.0 < 16.0.5561.1001sharepoint_server_2019 >= 16.0.0 < 16.0.10417.20175sharepoint_server_subscription_edition >= 16.0.0 < 16.0.19725.20434Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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CVE-2026-32201Medium· 6.5Microsoft SharePoint Server Spoofing Vulnerability
CVE-2026-56164Medium· 5.3Microsoft SharePoint Server Elevation of Privilege Vulnerability
CVE-2026-55040Critical· 9.1Microsoft SharePoint Server Security Feature Bypass Vulnerability
CVE-2026-45484High· 8.8Microsoft SharePoint Elevation of Privilege Vulnerability
CVE-2026-48560Medium· 5.4Microsoft SharePoint Server Spoofing Vulnerability