What is CVE-2025-59245?

CVE-2025-59245 is a critical-severity vulnerability in Microsoft Sharepoint Online, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2025-11-20.

How severe is CVE-2025-59245?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Deserialization in Microsoft Sharepoint Online

CVE-2025-59245

Microsoft SharePoint Online Elevation of Privilege Vulnerability

Vulnerability class: Insecure Deserialization

EPSS: 0.010 (60.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Microsoft Sharepoint Online
Microsoft Sharepoint_online

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-59245?: CVE-2025-59245 is a critical-severity vulnerability in Microsoft Sharepoint Online, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2025-11-20.
How severe is CVE-2025-59245?: Critical severity. CVSS v3 base score is 9.8 out of 10.