CVE-2026-85900CWE-502insecure-deserialization

CVE-2026-85900

High · published October 13, 2026

CVSS v3.1
8.8
EPSS
2%
Percentile
74.4
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
0.01519 · 74.4th percentile
Weakness
CWE-502 · Deserialization of Untrusted Data
Published
2026-10-13T23:21Z
Affected products (1)
ProductVersionsFixed in
microsoft/sharepoint_server< 16.0.20326.2019016.0.20326.20190
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85900 · [email protected]
EPSS history
Timeline
  • 15 OCT 03:34Z
    EPSS moved — → 2%
    epss
  • 13 OCT 19:00Z
    Microsoft Office SharePoint Remote Code Execution Vulnerability
    cvelistv5
  • 13 OCT 19:00Z
    Microsoft Office SharePoint Remote Code Execution Vulnerability
    cvelistv5