PT-2026-40203 · Microsoft · Sharepoint Server

Published 2026-05-12 · Updated 2026-05-12 · CVE-2026-40368

Positive Technologies (AI Summary)

CVSS v2.0

9.0

High

Base vector

AV:N/AC:L/Au:S/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Microsoft Office SharePoint (affected versions not specified)

Description Deserialization of untrusted data allows an authorized attacker to execute code over a network. Deserialization is the process of converting a data stream back into an object, which, when handled insecurely, can lead to remote code execution.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

RCE

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

BDU:2026-06850

CVE-2026-40368

Affected Products

Sharepoint Server

References · 5

• https://bdu.fstec.ru/vul/2026-06850 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40368 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-40368 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-40368 · Security Note
• https://twitter.com/windowsforum/status/2054283877896667190 · Twitter Post