CVE-2026-34928

Description

An origin validation vulnerability in the Apex One/SEP agent could allow a local attacker to escalate privileges on affected installations. This is similar to CVE-2026-34927 but exists in a different named pipe communication mechanism. Please note: an attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

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)

No configuration data available.

Trend Micro Apex One (受影响版本)

Trend Micro Security (受影响版本)

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * Conceptual PoC for CVE-2026-34928
 * This script demonstrates how a low-privileged user might attempt
 * to interact with a vulnerable named pipe.
 * Note: Actual packet structure and pipe name require reverse engineering.
 */
#include <windows.h>
#include <stdio.h>

int main() {
    HANDLE hPipe;
    char pipeName[] = "\\\\.\\pipe\\VULNERABLE_AGENT_PIPE"; // Placeholder
    char data[] = "MALICIOUS_PAYLOAD_BYTES"; // Placeholder
    DWORD bytesWritten;

    printf("[+] Attempting to connect to named pipe...\n");
    
    // Wait for pipe to be available (optional loop)
    while (1) {
        hPipe = CreateFileA(
            pipeName,
            GENERIC_READ | GENERIC_WRITE,
            0,
            NULL,
            OPEN_EXISTING,
            0,
            NULL
        );
        
        if (hPipe != INVALID_HANDLE_VALUE) {
            break;
        }
        Sleep(1000);
    }

    printf("[+] Connected to pipe. Sending payload...\n");
    
    BOOL result = WriteFile(
        hPipe,
        data,
        strlen(data),
        &bytesWritten,
        NULL
    );

    if (result) {
        printf("[+] Payload sent successfully. Check for privilege escalation.\n");
    } else {
        printf("[-] Failed to send payload. Error: %d\n", GetLastError());
    }

    CloseHandle(hPipe);
    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-34928
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-34928
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-34928/
[4] VulDB https://vuldb.com/cve/CVE-2026-34928
[5] https://success.trendmicro.com/en-US/solution/KA-0023430

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-34928", "sourceIdentifier": "[email protected]", "published": "2026-05-21T14:16:45.463", "lastModified": "2026-05-21T15:05:28.023", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "An origin validation vulnerability in the Apex One/SEP agent could allow a local attacker to escalate privileges on affected installations. This is similar to CVE-2026-34927 but exists in a different named pipe communication mechanism.\n\nPlease note: an attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability."}], "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}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-346"}]}], "references": [{"url": "https://success.trendmicro.com/en-US/solution/KA-0023430", "source": "[email protected]"}]}}