EUVD-2026-43943
GHSA-r464-pwqp-f636
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local EoP requiring an existing low-privileged session (AV:L, PR:L), reliably triggerable with no user interaction (AC:L, UI:N), yielding full SYSTEM-level C/I/A impact.
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
Relative path traversal in Windows User Interface Core allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows User Interface Core (UI Core) affects Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025, where a relative path traversal flaw lets an already-authenticated low-privileged user escalate to higher privileges on the local machine. The CVSS 3.1 score of 7.8 reflects full confidentiality, integrity, and availability impact once triggered, though attack requires local access and existing low-level privileges. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have authenticated local access with low privileges (PR:L, AV:L) on an affected build - Windows 11 24H2/25H2/26H1 or Windows Server 2025 - and the ability to invoke or supply input to the Windows User Interface Core component so that an attacker-controlled relative path is processed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, base 7.8) describes a locally-exploitable flaw requiring low privileges but no user interaction, with high impact to all three security properties - a classic privilege-escalation profile rather than a remotely wormable one. … 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 11 or Server 2025 host - for example via phishing, a compromised standard user account, or a low-integrity application sandbox - invokes the Windows User Interface Core component with a crafted relative path containing traversal sequences. The privileged component follows the path outside its intended directory, letting the attacker read, write, or execute in a higher-integrity context and escalate to SYSTEM or administrator. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50454 as documented in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50454 (Patch available per vendor advisory); deploy it to all Windows 11 24H2/25H2/26H1 and Windows Server 2025 systems, including Server Core installations, via Windows Update, WSUS, or your patch-management tooling. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 11 (versions 24H2, 25H2, 26H1) and Windows Server 2025 systems in your environment and prioritize patching servers that run critical services. …
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Same weakness CWE-23 – Relative Path Traversal
View allSame technique Path Traversal
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External POC / Exploit Code
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