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PatchSiren cyber security CVE debrief

CVE-2026-55144 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T17:17:09.327Z and has not been modified since then. This vulnerability affects Windows 11 and Windows Server systems, allowing an authorized attacker to perform tampering locally due to a missing cryptographic step in the Windows CryptoAPI. The vulnerability has a CVSS score of 7.1 and is classified as HIGH severity. Administrators and users of affected systems should be aware of this vulnerability and take necessary actions to mitigate it.

Vendor
Microsoft
Product
Windows 11 Version 24H2
CVSS
HIGH 7.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-21
Advisory published
2026-07-14
Advisory updated
2026-07-21

Who should care

Administrators and users of Windows 11 and Windows Server systems should be aware of this vulnerability and take necessary actions to mitigate it. Vulnerability management teams should review and update their processes to ensure timely patching of affected systems. Security teams should monitor systems for potential tampering attempts and review compensating controls for exposed systems.

Technical summary

A missing cryptographic step in the Windows CryptoAPI allows an authorized attacker to perform tampering locally. This vulnerability has a CVSS score of 7.1 and is classified as HIGH severity. The vulnerability affects Windows 11 and Windows Server systems. The Windows CryptoAPI is used for cryptographic operations, and the missing step could allow an attacker to manipulate data or systems. Official advisories and CVE records provide guidance on mitigation and affected scope.

Defensive priority

High priority should be given to patching vulnerable systems, especially those exposed to local attacks. Vulnerability management teams should focus on timely patching, and security teams should monitor for potential tampering attempts.

Recommended defensive actions

  • Apply the patch provided by Microsoft
  • Review and update vulnerability management processes
  • Monitor systems for potential tampering attempts
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD detail provide information on the vulnerability, its severity, and affected systems. Evidence is limited to public sources and may not reflect the full scope or impact of the vulnerability. Defenders should verify affected systems and review official advisories for mitigation guidance. Additional information from other sources is needed to fully understand the vulnerability's impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-55144 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-55144

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-55144 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-55144

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.