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Fencer Intel
high 7.1

CVE-2026-55144 json

Windows Cryptography API: Next Generation (CNG) Tampering Vulnerability

published 3mo ago modified yesterday also EUVD-2026-44034

cvss
7.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits
0
none known

Summary

Missing cryptographic step in Windows CryptoAPI allows an authorized attacker to perform tampering locally.

Patch / fix

  • Microsoft Windows 11 Version 24H2 10.0.26100.8875
  • Microsoft Windows 11 Version 25H2 10.0.26200.8875
  • Microsoft Windows 11 version 26H1 10.0.28000.2525
  • Microsoft Windows Server 2022 10.0.20348.5386
  • Microsoft Windows Server 2025 10.0.26100.33158
  • Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.33158

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
3mo ago

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
CNA 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected products

  • Microsoft Windows 11 Version 24H2
  • Microsoft Windows 11 Version 25H2
  • Microsoft Windows 11 version 26H1
  • Microsoft Windows Server 2022
  • Microsoft Windows Server 2025
  • Microsoft Windows Server 2025 (Server Core installation)

Classification

Weakness
  • CWE-325 Missing Cryptographic Step

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.