CVE-2009-3421

CRITICAL

Zenas PaoBacheca Guestbook 2.1 - Unauthenticated Authentication Bypass via login_ok Parameter

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2009-3421. PoCs published by SirGod.

AI-analyzed exploit summary This exploit demonstrates an authentication bypass vulnerability in PaoBacheca Guestbook 2.1 by manipulating the 'login_ok' parameter when 'register_globals' is enabled. The PoC provides a direct URL to bypass authentication without requiring valid credentials.

Description

login.php in Zenas PaoBacheca Guestbook 2.1, when register_globals is enabled, allows remote attackers to bypass authentication and gain administrative access by setting the login_ok parameter to 1.

Exploits (1)

exploitdb WORKING POC VERIFIED
by SirGod · textwebappsphp
https://www.exploit-db.com/exploits/9293

This exploit demonstrates an authentication bypass vulnerability in PaoBacheca Guestbook 2.1 by manipulating the 'login_ok' parameter when 'register_globals' is enabled. The PoC provides a direct URL to bypass authentication without requiring valid credentials.

Classification
Working Poc 90%
Attack Type
Auth Bypass
Complexity
Trivial
Reliability
Reliable
Target: PaoBacheca Guestbook 2.1
No auth needed
Prerequisites: register_globals = on · access to login.php
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (4)

Core 4
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/52100
Third Party Advisory, VDB Entry exploit x_refsource_exploit-db
http://www.exploit-db.com/exploits/9293
Broken Link, Exploit vdb-entry x_refsource_osvdb
http://www.osvdb.org/56757
Broken Link, Vendor Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/36023

Scores

CVSS v3 9.8
EPSS 0.0499
EPSS Percentile 91.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-287
Status published
Products (1)
zenas/pao-bacheca_guestbook 2.1
Published Sep 25, 2009
Tracked Since Feb 18, 2026