Improper access control in Microsoft SharePoint Server - CVE-2026-69282
Published: September 8, 2026
Vulnerability identifier: #VU147555
CSH Severity: Medium
CVSS v4: 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]
CVE-ID: CVE-2026-69282
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to improper access control in Microsoft Office SharePoint event receiver definition handling when processing a specially crafted event receiver definition. A remote user can submit a specially crafted event receiver definition that causes the server to load an attacker-specified code library and construct an attacker-specified type before authorization is verified to execute arbitrary code.
List-level permissions on a SharePoint site are required. User interaction is not required.
Affected software
Microsoft SharePoint Server
How to mitigate CVE-2026-69282
Install security update from vendor's website.
Microsoft SharePoint Server - update to 16.0.20326.20090