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PatchSiren cyber security CVE debrief

CVE-2026-55004 Microsoft CVE debrief

A double free vulnerability in Microsoft Printer Drivers allows an authorized attacker to elevate privileges locally. Multiple Windows versions and server releases are affected, including Windows 10 (1607, 1809, 21H2, 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server (2012, 2012 R2, 2016, 2019, 2022, 2025). This vulnerability has a high severity with a CVSS score of 7.8. Defenders should prioritize patching, especially for systems with exposed printer services or used by authorized users. Local privilege escalation requires verification from official sources. The CVE Program and NVD provide official records of this vulnerability. Microsoft has released a patch for this issue

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-10-08
Advisory published
2026-07-14
Advisory updated
2026-10-08

Who should care

Defenders responsible for Windows systems, especially those with printer services exposed or used by authorized users, should assess exposure and prioritize patching.

Why it matters

CVE-2026-55004 is a high-severity elevation of privilege vulnerability in Windows Print Configuration. Defenders should prioritize patching, especially for systems with exposed printer services or used by authorized users. Local privilege escalation and affected versions require verification from official sources.

  • Local privilege escalation requires verification from official sources.
  • Patching is a defensive priority.
  • Verify affected versions and apply compensating controls if needed.
  • Monitor for unusual printer driver activity.

Technical summary

The vulnerability is caused by a double free in Microsoft Printer Drivers, allowing an authorized attacker to elevate privileges locally. Affected versions include Windows 10 (1607, 1809, 21H2, 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server (2012, 2012 R2, 2016, 2019, 2022, 2025).

Defensive priority

Defenders should prioritize patching this vulnerability, especially for systems with printer services exposed or used by authorized users.

Recommended defensive actions

  • Patch affected Windows systems, prioritizing those with exposed printer services or used by authorized users.
  • Verify and apply Microsoft's security updates for CVE-2026-55004.
  • Monitor systems for unusual printer driver activity.

Evidence notes

The CVE Program and NVD provide official records of this vulnerability. Microsoft has released a patch for this issue. The vulnerability affects multiple Windows versions and server releases, including Windows 10, Windows 11, and Windows Server 2012 through 2025. Official sources should be consulted for the most accurate and up-to-date information on affected versions and mitigation strategies. Defenders should verify the affected scope, severity, and vendor guidance through official

Sources and references

Verified primary and authoritative sources

  • CVE-2026-55004 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-55004

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

  • CVE-2026-55004 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-55004

    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.