CVE-2026-45659

UNKNOWNKnown Exploited

CISA Known Exploited Vulnerability

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45659 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-45659

Remediation deadline: July 4, 2026

Ransomware use: Known

Description

Microsoft SharePoint Server contains a deserialization of untrusted data vulnerability which allows an authorized attacker to execute code over a network.

Timeline

Published:July 1st, 2026 12:00 AM

Last modified:July 1st, 2026 12:00 AM

Added to KEV:July 1st, 2026

CVSS Scoring

No CVSS v3 score available

Affected Software

From NVD CPE configuration data

Vendors

Microsoft

Products

SharePoint Server

Weaknesses (CWE)

CWE-502

References & Reports

Advisories, patches, and third-party reports

No references available.

Source: CISA KEV + NVD · Data may lag official sources by up to one minute