CVE-2026-58644Critical· 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 12.2 · 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.
Exploit-prediction probability, daily snapshots since Jul 17.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Federal remediation due Jul 19, 2026
Last analysed / modified upstream
1.5%
Nuclei ×1
1.5% → 61%
Added to the CISA catalog on Jul 16, 2026. Federal remediation due Jul 19, 2026. View catalog ↗
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
sharepoint_server < 16.0.19725.20434sharepoint_server = 2016sharepoint_server = 2019Upgrade past the affected range:
sharepoint_server 16.0.19725.20434Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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