CVE-2026-26154CWE-20

Windows Server Update Service (WSUS) Tampering Vulnerability

High · published April 14, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
68.8
In the wild
Unconfirmed
What it is

Improper input validation in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.01232 · 68.8th percentile
Weakness
CWE-20 · Improper Input Validation
Published
2026-04-14T16:56Z
EPSS history
Timeline
  • 14 APR 16:56Z
    Windows Server Update Service (WSUS) Tampering Vulnerability
    cvelistv5