CVE-2026-45659
Microsoft SharePoint Remote Code Execution Vulnerability
KEV RANSOMWAREHIGH 8.8EPSS 2.7%
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
- Affected
- Microsoft · Microsoft SharePoint Enterprise Server 2016 · Microsoft SharePoint Server 2019 · Microsoft SharePoint Server Subscription Edition
- CVSS v3.1 MICROSOFT
- 8.8 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS
- 2.70% chance of exploitation in the next 30 days, 86th percentile
- CISA KEV
- added 2026-07-01, used in ransomware campaigns
- Published
- 2026-05-22
- Updated
- 2026-08-11
Proof-of-concept exploits (1)
- HORKimhab/CVE-2026-456591★ · 2026-07-13