Microsoft SharePoint Server Deserialization of Untrusted Data Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 01/07/2026. Patch affected systems as an emergency. It is known to be used in ransomware campaigns.
| Package | Affected versions | Patched versions |
|---|---|---|
| sharepoint server | = 2016= 2019< 16.0.19725.20280 | 16.0.19725.20280 |
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
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