CVE-2026-63520

Microsoft SharePoint Server Remote Code Execution Vulnerability

Improper input validation in Microsoft Office SharePoint allows an unauthorized 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

8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.96% chance of exploitation in the next 30 days, 61st percentile

Published

2026-08-11

Updated

2026-10-08

Proof-of-concept exploits (1)

• hypnguyen1209/CVE-2026-635201★ · 2026-08-26

Security advisories

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63520

References

• CVE Record
• NVD entry

Related

• CVE-2026-55040
• CVE-2026-62911