CVE-2026-70259: Microsoft Office SharePoint Information Disclosure Vulnerability

Overview

Severity
Medium (CVSS 6.5)
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
Category
Information Disclosure
Exploit Status
Not Exploited
Exploitation Likelihood
Less Likely
Patch Tuesday
2026-Oct
Released
2026-10-13

Description

Server-side request forgery (ssrf) in Microsoft Office SharePoint allows an authorized attacker to disclose information over a network.

FAQ

Is the Preview Pane an attack vector for this vulnerability? No, the Preview Pane is not an attack vector. I am running SharePoint Server 2016. Do the updates for SharePoint Enterprise Server 2016 also apply to the version I am running? Yes. The same KB number applies to both SharePoint Server 2016 and SharePoint Enterprise Server 2016. Customers running either version should install the security update to be protected from this vulnerability. What type of information could be disclosed by this vulnerability? This vulnerability could disclose sensitive information, which might include a user's full trust token.

Affected Products (1)

Microsoft Office

  • Microsoft SharePoint Server Subscription Edition

Security Updates (1)

Acknowledgments

<a href="https://www.linkedin.com/in/boolgombear/">Minjea Park</a>, Jmini

Revision History

  • 2026-10-13: Information published.