CVE-2026-63520

high

Description

Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.

References

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

https://www.helpnetsecurity.com/2026/08/13/microsoft-sharepoint-cve-2026-55040-poc-exploit/

https://www.securityweek.com/sharepoint-vulnerability-exploited-shortly-after-poc-release/

https://www.helpnetsecurity.com/2026/08/12/august-2026-patch-tuesday-cve-2026-68820/

https://thehackernews.com/2026/08/researchers-disclose-ai-assisted.html

https://thehackernews.com/2026/08/microsoft-patches-398-flaws-including.html

https://www.tenable.com/blog/microsofts-august-2026-patch-tuesday-addresses-398-cves-cve-2026-68820

https://github.com/virologi-info/mssharepoint-scanner

https://github.com/hypnguyen1209/CVE-2026-63520

Details

Source: Mitre, NVD

Published: 2026-08-11

Updated: 2026-08-13

Risk Information

CVSS v2

Base Score: 7.6

Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 8.1

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

Severity: High

EPSS

EPSS: 0.01122

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest