Server-Side Request Forgery (SSRF) in Microsoft SharePoint Server - CVE-2026-109502
Published: November 10, 2026
Vulnerability identifier: #VU164753
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-2026-109502
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to escalate privileges to those of the SharePoint farm service account.
The vulnerability exists due to server-side request forgery in Microsoft SharePoint Server when handling requests from users with permission to edit business data connection metadata. A remote user can send a specially crafted request to expose authentication information for the privileged SharePoint farm service account and potentially act with that account's privileges.
Affected software
Microsoft SharePoint Server
How to mitigate CVE-2026-109502
Install security update from vendor's website.
Microsoft SharePoint Server - update to 16.0.20326.20278