CVE-2026-45659
CISA KEV RANSOMWARE
ACT NOW
Priority: 0.00
BB Relevance:
10/100
Published: N/A
Modified: N/A
First seen: 2026-10-29
Status: pending_score
Description
Microsoft SharePoint Server contains a deserialization of untrusted data vulnerability which allows an authorized attacker to execute code over a network.
CISA Known Exploited Vulnerability
Vendor / Product
Microsoft — SharePoint Server
Date Added
2026-07-01
Remediation Due
2026-07-04
Ransomware Use
CONFIRMED
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
Weakness Classification (1)
Affected Software (3)
| Vendor | Product | Version |
|---|---|---|
| microsoft | sharepoint_server | < 16.0.19725.20280 |
| microsoft | sharepoint_server | 2016 |
| microsoft | sharepoint_server | 2019 |
References & Advisories (2)
Vendor Advisory
US Government Resource