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Vulnerabilities

Vulnerability · CVE-2026-83798

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

Published Oct 13, 2026 · catalog updated Oct 14, 2026 · Improper verification of cryptographic

Check if you run it

No confirmed exploitation is on record for CVE-2026-83798. EPSS is 0.21%. Act only if a listed version of Improper verification of cryptographic is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Improper verification of cryptographic).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.21%
Remediation
Advisory link
Affected products
See sources for product scope

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

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-83798

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-83798. EPSS is 0.21%. Act only if a listed version of Improper verification of cryptographic is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-20: Improper Input Validation; CWE-347: Improper Verification of Cryptographic Signature. EPSS 0.21%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Windows security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · NIST NVD

    Detected

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

  2. Oct 14, 2026 · NIST NVD

    Updated

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

Sources

  • CVE.orgVulnerability recordCVE-2026-83798

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-83798

    30-day exploitation probability 0.2%

    first.org
  • NIST NVDVulnerability recordCVE-2026-83798

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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.