CVE-2006-6421

phpBB 2.0.x - Authenticated Cross-Site Scripting via Private Message Body Field

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2006-6421. PoCs published by Demential.

AI-analyzed exploit summary This exploit demonstrates an HTML injection vulnerability in phpBB 2.0.21 by embedding a malicious Shockwave Flash file that sends a crafted POST request to inject JavaScript, stealing user cookies via XSS.

Description

Cross-site scripting (XSS) vulnerability in the private message box implementation (privmsg.php) in phpBB 2.0.x allows remote authenticated users to inject arbitrary web script or HTML via the "Message body" field in a message to a non-existent user.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Demential · htmlwebappsphp
https://www.exploit-db.com/exploits/29442

This exploit demonstrates an HTML injection vulnerability in phpBB 2.0.21 by embedding a malicious Shockwave Flash file that sends a crafted POST request to inject JavaScript, stealing user cookies via XSS.

Classification
Working Poc 90%
Attack Type
Xss
Complexity
Moderate
Reliability
Reliable
Target: phpBB 2.0.21
No auth needed
Prerequisites: Ability to host a malicious SWF file · Victim interaction to load the malicious webpage
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (10)

Core 10
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/30776
Third Party Advisory, VDB Entry mailing-list x_refsource_bugtraq
http://www.securityfocus.com/archive/1/456579/100/0/threaded
Various Sources x_refsource_confirm
http://www.phpbb.com/phpBB/viewtopic.php?f=14&t=489624
Third Party Advisory, VDB Entry mailing-list x_refsource_bugtraq
http://www.securityfocus.com/archive/1/456728/100/100/threaded
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/22001
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/21806
Third Party Advisory, VDB Entry mailing-list x_refsource_bugtraq
http://www.securityfocus.com/archive/1/456784/100/100/threaded
Third Party Advisory, VDB Entry mailing-list x_refsource_bugtraq
http://www.securityfocus.com/archive/1/453774/100/0/threaded
Third Party Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/23283
Third Party Advisory third-party-advisory x_refsource_sreason
http://securityreason.com/securityalert/2005

Scores

EPSS 0.1500
EPSS Percentile 96.3%

Details

Status published
Products (32)
phpbb_group/phpbb 2.0
phpbb_group/phpbb 2.0.0
phpbb_group/phpbb 2.0.1
phpbb_group/phpbb 2.0.2
phpbb_group/phpbb 2.0.3
phpbb_group/phpbb 2.0.4
phpbb_group/phpbb 2.0.5
phpbb_group/phpbb 2.0.6
phpbb_group/phpbb 2.0.6c
phpbb_group/phpbb 2.0.6d
... and 22 more
Published Dec 10, 2006
Tracked Since Feb 18, 2026