Exploited vulnerability

CVE-2026-50522

TLP:CLEAR

Microsoft SharePoint Deserialization of Untrusted Data Vulnerability

Microsoft SharePoint contains a deserialization of untrusted data vulnerability which could allow an unauthorized attacker to execute code over a network.

Facts

Vendor: Microsoft
Product: SharePoint
CVSS: 9.8
EPSS (probability of exploitation within 30 days): 3 %
On CISA's Known Exploited Vulnerabilities list since: 22 July 2026
First known exploitation: 22 July 2026
CISA's deadline for US federal agencies: 25 July 2026
Weakness: CWE-502
First seen by Risk Letters: 14 July 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

Get the full brief

Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD