CVE-2026-45659

8.8 highKEVEPSS 80%

High (8.8) in Microsoft SharePoint Server. In CISA KEV since 2026-07-01, with known ransomware use. EPSS 80% chance of exploitation in the next 30 days.

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

Severity

CVSS 3.1

8.8 high

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 80% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-31)
CISA KEV: listed 2026-07-01, due 2026-07-04, known ransomware use
CWE: CWE-502
Published: 2026-05-22
Modified: 2026-07-23
Record from: the NVD, synced 2026-10-19

Affected

microsoft:sharepoint_server

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45659
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45659

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