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CVE-2026-26183 Microsoft CVE debrief

CVE-2026-26183 is a Remote Access Management service/API (RPC server) Elevation of Privilege Vulnerability affecting multiple Windows Server versions. Microsoft has released patches for this vulnerability, which has a CVSS score of 7.8 and is considered HIGH severity. The vulnerability is caused by improper access control in the Windows RPC API, allowing an authorized attacker to elevate privileges locally. Affected versions include Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025. System administrators and security teams should assess exposure and apply patches immediately. Verification of system configurations and inventory for affected versions, as well as monitoring for

Vendor
Microsoft
Product
Windows Server 2012
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

System administrators and security teams responsible for Windows Server infrastructure should assess exposure and apply patches immediately. This vulnerability requires verification of system configurations and inventory for affected versions, as well as monitoring for suspicious activity related to RPC service/API.

Why it matters

CVE-2026-26183 is a high-severity vulnerability allowing local privilege escalation in multiple Windows Server versions. Defenders should apply patches immediately, verify system configurations, and monitor for suspicious activity.

  • Local privilege escalation is possible for authorized attackers
  • Affected Windows Server versions require immediate patching
  • System configurations and inventory verification is necessary
  • Monitoring for suspicious RPC service/API activity is recommended

Technical summary

The Remote Access Management service/API (RPC server) Elevation of Privilege Vulnerability (CVE-2026-26183) is caused by improper access control in the Windows RPC API. This allows an authorized attacker to elevate privileges locally. The vulnerability affects multiple Windows Server versions, including Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025.

Defensive priority

Apply patches immediately for Windows Server versions affected by CVE-2026-26183, as it allows for local privilege escalation.

Recommended defensive actions

  • Apply patches for affected Windows Server versions
  • Verify system configurations and inventory for affected versions
  • Monitor for suspicious activity related to RPC service/API

Evidence notes

The CVE record and source item provide details on the vulnerability, affected products, and references to vendor advisories. However, there is limited information on exploitation or impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-26183 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-26183

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

  • CVE-2026-26183 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-26183

    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.