CVE-2026-45659

high Microsoft ⚠️ CISA KEV — Exploited in the Wild
CVSS v3 Base Score
8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score
3.0%
Exploitation probability in 30 days
Top 14% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Published: May 22, 2026 (48 days ago)
Last Modified: July 2, 2026
Vendor: Microsoft
Source: NVD

⚠️ CISA Known Exploited Vulnerability

Added to KEV: 2026-07-01
Remediation Due: 2026-07-04 (⚠ 6d overdue)

Description

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

CWE

CWE-502

Affected Products

microsoft sharepoint server

References

🔗 msrc.microsoft.com 🔗 www.cisa.gov