PT-2026-40138 · Microsoft · Sharepoint Server

CVE-2026-33112 · Published 2026-05-12 · Updated 2026-07-08

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 An issue exists in the deserialization mechanism of Microsoft Office SharePoint, where the software fails to properly handle untrusted data. This flaw allows an authorized attacker, including those with low-privilege Site Member permissions, to bypass the XmlValidator security control and execute arbitrary code remotely over a network.

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

DoS

RCE

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

BDU:2026-06805

CVE-2026-33112

Affected Products

Sharepoint Server

References · 12

• https://bdu.fstec.ru/vul/2026-06805 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33112 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-33112 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-33112 · Security Note
• https://safe-surf.ru/specialists/bulletins-nkcki/731809 · Security Note
• https://feedly.com/cve/CVE-2026-33112 · Note
• https://twitter.com/windowsforum/status/2054303059157594536 · Twitter Post
• https://twitter.com/zoomeye_team/status/2074739867930534381 · Twitter Post
• https://twitter.com/f1tym1/status/2074639426274185216 · Twitter Post
• https://twitter.com/_l0gg/status/2071848036976996505 · Twitter Post
• https://twitter.com/_l0gg/status/2054454866110742906 · Twitter Post
• https://twitter.com/Daily_CyberSec/status/2074499704742916328 · Twitter Post