CyberSecBulletin
CVE-2026-118737NVD status: Awaiting Analysis

Windows 10 Version 1607: Improper Verification of Cryptographic Signature

Published Updated By the CyberSecBulletin desk

CVE-2026-118737 is a high-severity improper verification of cryptographic signature vulnerability in Windows 10 Version 1607 from Microsoft, with a CVSS 3.1 base score of 8.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 10.0.14393.9688 as the first without the flaw, so updating Windows 10 Version 1607 to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.71% chance of exploitation within 30 days, higher than 54% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Windows 10 Version 1607 to 10.0.14393.9688 or a later version.
  2. Update Windows 10 Version 1809 to 10.0.17763.9487 or a later version.
  3. Update Windows 10 Version 21H2 to 10.0.19044.7846 or a later version.
  4. Read the advisory on msrc.microsoft.com for workarounds and exact fixed builds.
  5. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
MicrosoftWindows 10 Version 160710.0.14393.0 up to, but not including, 10.0.14393.968810.0.14393.9688
MicrosoftWindows 10 Version 180910.0.17763.0 up to, but not including, 10.0.17763.948710.0.17763.9487
MicrosoftWindows 10 Version 21H210.0.19044.0 up to, but not including, 10.0.19044.784610.0.19044.7846
MicrosoftWindows 10 Version 22H210.0.19045.0 up to, but not including, 10.0.19045.784610.0.19045.7846
MicrosoftWindows 11 version 23H210.0.22631.0 up to, but not including, 10.0.22631.771110.0.22631.7711
MicrosoftWindows 11 Version 24H210.0.26100.0 up to, but not including, 10.0.26100.997410.0.26100.9974
MicrosoftWindows 11 Version 25H210.0.26200.0 up to, but not including, 10.0.26200.997410.0.26200.9974
MicrosoftWindows 11 version 26H110.0.28000.0 up to, but not including, 10.0.28000.350110.0.28000.3501
MicrosoftWindows 11 Version 26H210.0.26300.0 up to, but not including, 10.0.26300.997410.0.26300.9974
MicrosoftWindows Server 201610.0.14393.0 up to, but not including, 10.0.14393.968810.0.14393.9688
MicrosoftWindows Server 2016 (Server Core installation)10.0.14393.0 up to, but not including, 10.0.14393.968810.0.14393.9688
MicrosoftWindows Server 201910.0.17763.0 up to, but not including, 10.0.17763.948710.0.17763.9487
MicrosoftWindows Server 2019 (Server Core installation)10.0.17763.0 up to, but not including, 10.0.17763.948710.0.17763.9487
MicrosoftWindows Server 202210.0.20348.0 up to, but not including, 10.0.20348.587010.0.20348.5870
MicrosoftWindows Server 202510.0.26100.0 up to, but not including, 10.0.26100.3382210.0.26100.33822
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0 up to, but not including, 10.0.26100.3382210.0.26100.33822

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
HighSuccess depends on conditions outside the attacker's control.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (microsoft.com).

Official description

Improper verification of cryptographic signature in Windows Remote Procedure Call Runtime allows an unauthorized attacker to execute code over a network.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Verification of Cryptographic Signature

The product does not verify, or incorrectly verifies, the cryptographic signature for data.

More Improper Verification of Cryptographic Signature vulnerabilities (CWE-347)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).

References

Recent Improper Verification of Cryptographic Signature vulnerabilities

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