CVE-2026-45659
Microsoft SharePoint Server Deserialization of Untrusted Data Vulnerability
IN CISA KEV
Microsoft SharePoint Server contains a deserialization of untrusted data vulnerability which allows an authorized attacker to execute code over a network.
- Vendor
- Microsoft
- Product
- SharePoint Server
- CVSS
- No score recorded (no NVD record loaded for this entry)
- CWE
- CWE-502
- Published
- Not recorded
- NVD modified
- Not recorded
CISA KEV
- Date added
- 2026-07-01
- Due date
- 2026-07-04
- Ransomware use
- Known
- Required action
- Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
EPSS
2.70% chance of exploitation in the next 30 days (percentile 85th)
FIRST EPSS, updated 17 Oct 2026. About EPSS
CVSS is severity, EPSS is likelihood, KEV means already exploited. EPSS is a statistical probability, not a certainty: a low score does not make a bug safe, and a high one does not prove it is being exploited.
Data last updated 18 Oct 2026. Sources: NVD API 2.0, CISA KEV catalog, FIRST EPSS. Links: NVD, CISA KEV. Metadata only. ThreatWire does not host exploit code.