Server-Side Request Forgery (SSRF) in Microsoft SharePoint Server - CVE-2026-70259
Published: October 14, 2026
Vulnerability identifier: #VU154686
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-70259
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to server-side request forgery in Microsoft Office SharePoint when handling network requests. A remote user can exploit the server-side request forgery to disclose sensitive information.
The disclosed information might include a user's full trust token. The Preview Pane is not an attack vector.
Affected software
Microsoft SharePoint Server
How to mitigate CVE-2026-70259
Install security update from vendor's website.
Microsoft SharePoint Server - update to 16.0.20326.20190