CVE-2026-70321CWE-502insecure-deserialization

CVE-2026-70321

High · published August 11, 2026

CVSS v3.1
8.8
EPSS
2%
Percentile
76.9
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
CVSS v4.0
Not supplied
EPSS
0.01694 · 76.9th percentile
Weakness
CWE-502 · Deserialization of Untrusted Data
Published
2026-08-11T21:19Z
Affected products (1)
ProductVersionsFixed in
microsoft/sharepoint_server< 16.0.19725.2052216.0.19725.20522
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70321 · [email protected]
EPSS history
Timeline
  • 11 AUG 17:05Z
    Microsoft SharePoint Remote Code Execution Vulnerability
    cvelistv5