EUVD-2026-43787
GHSA-wvqj-vj23-9cf7
Severity by source
AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Network-reachable but requires an authenticated foothold (PR:L) and victim interaction (UI:R); traversal yields full code execution, so C/I/A all High with unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Relative path traversal in Windows PowerShell allows an authorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Windows PowerShell allows an authenticated attacker with low privileges to run arbitrary code across a network by exploiting a relative path traversal (CWE-23) flaw, provided a victim is induced to interact (UI:R). Affecting supported Windows 10/11 clients and Windows Server 2012 through 2025, the issue carries a CVSS 8.0 with full confidentiality, integrity, and availability impact, and a vendor patch is available via MSRC. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Per the CVSS vector, exploitation requires the attacker to already hold some authenticated privilege on or reachable to the target (PR:L) and requires user interaction (UI:R) - a victim must be induced to trigger the vulnerable PowerShell path resolution (for example by running a supplied script, module, or command that references an attacker-controlled relative path). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H, 8.0 High) describes a network-reachable, low-complexity attack that nonetheless requires both some level of authenticated privilege (PR:L) and victim interaction (UI:R), which meaningfully raises the bar versus a fully unauthenticated wormable flaw. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker holding a low-privilege authenticated foothold sends a specially crafted request or lure that causes a targeted user's PowerShell session to resolve a malicious relative path, and once the victim interacts (e.g., runs a script or opens a supplied item) the traversal loads attacker-controlled code that executes with the victim's rights. No public POC was identified at time of analysis, so exploitation would currently require independent development against the traversal in PowerShell's path handling. |
| Remediation | Apply the Microsoft security update for CVE-2026-40400; a vendor patch is available, so install the relevant monthly cumulative/security-only update for each affected Windows client and server SKU as listed in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40400 (consult that page for the exact fixed build per OS version, as no single fix version string was supplied in the input). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, 11, and Windows Server 2012-2025 systems and verify current PowerShell versions against your asset database. …
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Same weakness CWE-23 – Relative Path Traversal
View allSame technique Path Traversal
View allShare
External POC / Exploit Code
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