CVE-2026-45659High· 8.8▾ Abyssal⚠ Exploited in the wildPoC availableDeserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
▾ Abyssal zone — Critical with a public exploit or in-the-wild use
impact 48.4 · likelihood 16 · exploitation 25 · ransomware 5
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.
Exploit-prediction probability, daily snapshots since Aug 1.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Federal remediation due Jul 4, 2026
Last analysed / modified upstream
9.1%
1 GitHub repo
9.1% → 80%
Added to the CISA catalog on Jul 1, 2026. Federal remediation due Jul 4, 2026. View catalog ↗
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
sharepoint_server < 16.0.19725.20280sharepoint_server = 2016sharepoint_server = 2019Upgrade past the affected range:
sharepoint_server 16.0.19725.20280Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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