CVE-2026-50522

critical Microsoft ⚠️ CISA KEV — Exploited in the Wild
CVSS v3 Base Score
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score
21.0%
Exploitation probability in 30 days
Top 3% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Published: July 14, 2026 (54 days ago)
Last Modified: July 23, 2026
Vendor: Microsoft
Source: NVD

⚠️ CISA Known Exploited Vulnerability

Added to KEV: 2026-07-22
Remediation Due: 2026-07-25 (⚠ 44d overdue)

Description

Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.

CWE

CWE-502

Affected Products

microsoft sharepoint server

References

🔗 msrc.microsoft.com 🔗 www.cisa.gov