CVE-2026-63520: high-severity vulnerability in Microsoft SharePoint Enterprise Server 2016
Microsoft SharePoint Server Remote Code Execution Vulnerability
Published · Updated
63Vexday Risk Score
Prioritize patching. It exploitation observed by VulnCheck and has a public proof of concept.
ssvc Actcvss 8.1epss 1.0%
from disclosure to weapon15 days
Published on NVDAug 11
1st PoC+15d
VulnCheck+14d
exploitation probability
1.0%top 40% of all CVEs
observed exploitation
yesVulnCheck
2 public exploit(s)
Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Affected products
Microsoft · Microsoft SharePoint Enterprise Server 2016Microsoft · Microsoft SharePoint Server 2019Microsoft · Microsoft SharePoint Server Subscription Editionpublic PoCs found — 2
githubgithub.com/hypnguyen1209/CVE-2026-63520★ 1vulncheckvulncheck.com/xdb/150b499f1604unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — Microsoft SharePoint Enterprise Server 2016
In the same product, most dangerous first.
CVE-2025-53770CRITICALMicrosoft SharePoint Server Remote Code Execution VulnerabilityEPSS 100.0%KEVCVE-2025-49704HIGHMicrosoft SharePoint Remote Code Execution VulnerabilityEPSS 100.0%KEVCVE-2023-29357CRITICALMicrosoft SharePoint Server Elevation of Privilege VulnerabilityEPSS 100.0%KEVCVE-2025-49706MEDIUMMicrosoft SharePoint Server Spoofing VulnerabilityEPSS 99.1%KEVCVE-2023-24955HIGHMicrosoft SharePoint Server Remote Code Execution VulnerabilityEPSS 85.0%KEVCVE-2026-55040CRITICALMicrosoft SharePoint Server Security Feature Bypass VulnerabilityEPSS 69.5%KEV