CVE-2026-551447.1HighCWE-325

CVE-2026-55144: Windows Cryptography API: Next Generation (CNG) Tampering Vulnerability

Microsoft · Windows 11 Version 24H2

Vendor fix available · Affected: Microsoft Windows 11 Version 24H2 · Exploitation: unlikely (under 1%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

0.2%probability of exploitation in the next 30 days

13th percentile

050100

Higher than 13% of scored CVEs

7.1HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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

Affected products6

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Microsoft · Windows 11 Version 24H2from 10.0.26100.0 before 10.0.26100.8875
Microsoft · Windows 11 Version 25H2from 10.0.26200.0 before 10.0.26200.8875
Microsoft · Windows 11 version 26H1from 10.0.28000.0 before 10.0.28000.2525
Microsoft · Windows Server 2022from 10.0.20348.0 before 10.0.20348.5386
Microsoft · Windows Server 2025from 10.0.26100.0 before 10.0.26100.33158
Microsoft · Windows Server 2025 (Server Core installation)from 10.0.26100.0 before 10.0.26100.33158

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

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Exploitation: Unlikely (under 1%). EPSS under 1%, or no score yet.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Missing Cryptographic Step · Cryptography
Vendor: Microsoft
Published: July 2026
Band: Unlikely (under 1%), July 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-55144 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.