CVE-2026-20856
Medium
Elevated severity or exploit probability.
CVSS base
8.1
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
1.1%
65.0th percentile
CISA KEV
Not listed
Weakness / dates
CWE-20
Published 2026-01-13 · modified 2026-07-30
Description
Improper input validation in Windows Server Update Service allows an unauthorized attacker to execute code over a network.