SB2026090913 - Missing Authorization in Microsoft SharePoint Server

Description

This security bulletin contains information about 1 vulnerability.

1) Missing Authorization (CVE-ID: CVE-2026-69465)

CWE-ID: CWE-862 - Missing Authorization

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote user to execute arbitrary code.

The vulnerability exists due to missing authorization in Microsoft Office SharePoint when processing specially crafted page markup. A remote user can submit specially crafted page markup that bypasses a control-safety check and causes the server to load a code library from a remote network location under their control to execute arbitrary code.

The user must have permission to edit page content on a SharePoint site. User interaction is not required.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-69465
• https://support.microsoft.com/help/5002908