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PatchSiren cyber security CVE debrief

CVE-2026-33101 Microsoft CVE debrief

A Windows Print Spooler Elevation of Privilege Vulnerability exists, allowing an authorized attacker to elevate privileges locally due to a use-after-free issue in Windows Print Spooler Components. This vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. The vulnerability exists in the Windows Print Spooler Components and allows an authorized attacker to elevate privileges locally. Affected products include Windows 11 versions 24H2, 25H2, 26H1, and Windows Server 2022, 23H2 Edition (Server Core installation), Windows Server 2025.

Vendor
Microsoft
Product
Windows 11 Version 24H2
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-14
Original CVE updated
2026-10-15
Advisory published
2026-04-14
Advisory updated
2026-10-15

Who should care

Defenders responsible for Windows systems, especially those with high-risk exposure, should prioritize patching affected systems. This includes administrators of Windows 11 and Windows Server installations, as well as security teams and vulnerability management teams responsible for ensuring the security of these systems.

Why it matters

CVE-2026-33101 is a high-severity elevation of privilege vulnerability in Windows Print Spooler Components. Defenders should prioritize patching affected systems to prevent potential exploitation.

  • Potential privilege escalation on affected systems
  • Requires patching to prevent exploitation
  • Defenders should verify system exposure and apply updates

Technical summary

The vulnerability exists in the Windows Print Spooler Components and allows an authorized attacker to elevate privileges locally due to a use-after-free issue. Affected products include Windows 11 versions 24H2, 25H2, 26H1, and Windows Server 2022, 23H2 Edition (Server Core installation), Windows Server 2025.

Defensive priority

Defenders should prioritize patching affected systems, especially those with high-risk exposure, such as Windows 11 and Windows Server installations.

Recommended defensive actions

  • Patch affected Windows 11 and Windows Server installations
  • Verify and apply Microsoft's security updates
  • Monitor systems for potential exploitation attempts

Evidence notes

The CVE Program and NVD provide official records of this vulnerability. Microsoft has released a patch for this issue. Affected products include Windows 11 versions 24H2, 25H2, 26H1, and Windows Server 2022, 23H2 Edition (Server Core installation), Windows Server 2025.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-33101 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-33101

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

  • CVE-2026-33101 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-33101

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

Supplemental references

  • Windows Print Spooler Elevation of Privilege Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33101.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33101

    Supplemental source - vendor-advisory, patch

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.