CVE-2006-5503

Simple Machines Forum 1.1 RC2 - Cross-Site Scripting via Index.php Action Parameter

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2006-5503. PoCs published by b0rizQ.

AI-analyzed exploit summary This exploit demonstrates a cross-site scripting (XSS) vulnerability in Simple Machines Forum (SMF) by injecting arbitrary JavaScript code via the 'action' parameter in the URL. The vulnerability arises due to insufficient input sanitization.

Description

Cross-site scripting (XSS) vulnerability in index.php in Simple Machines Forum (SMF) 1.1 RC2 allows remote attackers to inject arbitrary web script or HTML via the action parameter.

Exploits (1)

exploitdb WORKING POC VERIFIED
by b0rizQ · textwebappsphp
https://www.exploit-db.com/exploits/28831

This exploit demonstrates a cross-site scripting (XSS) vulnerability in Simple Machines Forum (SMF) by injecting arbitrary JavaScript code via the 'action' parameter in the URL. The vulnerability arises due to insufficient input sanitization.

Classification
Working Poc 90%
Attack Type
Xss
Complexity
Trivial
Reliability
Reliable
Target: Simple Machines Forum (SMF) versions 1.1 RC1, 1.1 RC2, and 1.0.8 and prior
No auth needed
Prerequisites: Access to the target SMF instance · User interaction to click the malicious link
MITRE ATT&CK
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (4)

Core 4
Core References
Third Party Advisory, VDB Entry mailing-list x_refsource_bugtraq
http://www.securityfocus.com/archive/1/449241/100/0/threaded
Third Party Advisory third-party-advisory x_refsource_sreason
http://securityreason.com/securityalert/1772
Exploit vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/20629
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/29690

Scores

EPSS 0.0158
EPSS Percentile 72.4%

Details

Status published
Products (1)
simple_machines/simple_machines_forum 1.1_rc2
Published Oct 25, 2006
Tracked Since Feb 18, 2026