CVE-2026-88166CWE-121CWE-190

CVE-2026-88166

High · published October 13, 2026

CVSS v3.1
8.8
EPSS
1%
Percentile
56.7
In the wild
Unconfirmed
What it is

Integer overflow or wraparound 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
0.00819 · 56.7th percentile
Weaknesses
CWE-121 · Stack-based Buffer Overflow; CWE-190 · Integer Overflow or Wraparound
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-2026-88166 · [email protected]
EPSS history
Timeline
  • 15 OCT 03:35Z
    EPSS moved — → 1%
    epss
  • 13 OCT 19:01Z
    Microsoft Office SharePoint Remote Code Execution Vulnerability
    cvelistv5
  • 13 OCT 19:01Z
    Microsoft Office SharePoint Remote Code Execution Vulnerability
    cvelistv5