EUVD-2026-43927
GHSA-8p36-2272-5qg7
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Requires an existing low-privileged local account (PR:L, AV:L) to trigger a reliable authorization bypass yielding SYSTEM-level control, so full C/I/A high, scope unchanged.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Improper authorization in RPC Runtime allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Microsoft Windows RPC Runtime lets an already-authenticated low-privileged user gain SYSTEM-level control due to improper authorization (CWE-285). Affecting a broad range of Windows client and server releases from Windows Server 2012 through Windows 11 26H1 and Server 2025, the flaw carries CVSS 7.8 with high confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must already possess valid low-privileged local access to the target Windows system (CVSS PR:L), and exploitation occurs entirely locally (AV:L) with no user interaction (UI:N) and low attack complexity (AC:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H describes a local (AV:L), low-complexity (AC:L) attack requiring existing low privileges (PR:L) and no user interaction, yielding full high impact on confidentiality, integrity, and availability within an unchanged scope - a classic reliable local privilege-escalation profile scoring 7.8 (High). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a low-privileged foothold on a Windows host - for example via phishing, a compromised standard user account, or a low-privilege service - invokes the vulnerable RPC Runtime operation to bypass authorization checks and execute code or actions in a SYSTEM context. Given AV:L/AC:L, the technique is reliable and requires no victim interaction, making it an ideal second-stage step to escalate from initial access to full host compromise. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50346 (Patch available per vendor advisory) via the Microsoft Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50346, selecting the specific fixed build for each affected client and server SKU during your normal patch cycle; the input does not disclose exact fixed version numbers, so pull them directly from the MSRC page rather than inventing them. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct an inventory of all Windows systems running Server 2012 R2 through Server 2025 and Windows 11 up to version 26H1, and identify systems containing sensitive data or supporting critical business processes for expedited patching. …
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Same weakness CWE-285 – Improper Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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