CVE-2026-102866CWE-347

CVE-2026-102866

High · published October 13, 2026

CVSS v3.1
8.1
EPSS
1%
Percentile
44.6
In the wild
Unconfirmed
What it is

Improper verification of cryptographic signature in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00540 · 44.6th percentile
Weakness
CWE-347 · Improper Verification of Cryptographic Signature
Published
2026-10-13T23:17Z
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-2026-102866 · [email protected]
EPSS history
Timeline
  • 15 OCT 03:28Z
    EPSS moved — → 1%
    epss
  • 13 OCT 18:59Z
    Microsoft Office SharePoint Elevation of Privilege Vulnerability
    cvelistv5
  • 13 OCT 18:59Z
    Microsoft Office SharePoint Elevation of Privilege Vulnerability
    cvelistv5