CVE-2026-83798CWE-20CWE-347

CVE-2026-83798

Medium · published October 13, 2026

CVSS v3.1
5.5
EPSS
0%
Percentile
11.3
In the wild
Unconfirmed
What it is

Improper verification of cryptographic signature in Windows Update Stack allows an authorized attacker to perform spoofing locally.

The record
Technical detail
CVSS v3.1
5.5 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00215 · 11.3th percentile
Weaknesses
CWE-20 · Improper Input Validation; CWE-347 · Improper Verification of Cryptographic Signature
Published
2026-10-13T23:20Z
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83798 · [email protected]
EPSS history
Timeline
  • 15 OCT 03:34Z
    EPSS moved — → 0%
    epss
  • 13 OCT 18:59Z
    Windows Update Stack Spoofing Vulnerability
    cvelistv5
  • 13 OCT 18:59Z
    Windows Update Stack Spoofing Vulnerability
    cvelistv5