CVE-2026-40365CWE-1220

Microsoft SharePoint Server Remote Code Execution Vulnerability

High · published May 12, 2026

CVSS v3.1
8.8
EPSS
1%
Percentile
64.0
In the wild
Unconfirmed
What it is

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.01051 · 64.0th percentile
Weakness
CWE-1220 · Insufficient Granularity of Access Control
Published
2026-05-12T16:59Z
EPSS history
Timeline
  • 12 MAY 16:59Z
    Microsoft SharePoint Server Remote Code Execution Vulnerability
    cvelistv5