CVE-2026-63520
HighPublished
Microsoft SharePoint Server Remote Code Execution Vulnerability
- Published
- Aug 11, 2026
- Updated
- Sep 16, 2026
- Assigning CNA
- microsoft
- Evidence observed
- Aug 27, 2026
Primary CVSS
8.1/ 10High
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H2.9%
Low · next 30 days
- Percentile
- 86.2%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
Sources
1- CVE-2026-63520Exploit
Exploit chain for unauthenticated RCE on Microsoft SharePoint, combining a JWT authentication bypass with unsafe .NET type instantiation to achieve code execution as the service account.
Responsible use
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