Vulnerability Report

CVE-2006-6421

Title: Phpbb Group Phpbb Cross-Site Scripting (XSS)

XSS

Proof Of Concept

PoC Available for CVE-2006-6421

CWE Category NVD-CWE-noinfo

Published Date Dec 10, 2006

Modified Date Jun 16, 2026

Exploit Status Available

Score 6.0 CVSS v2.0

Exploit Probability (EPSS)

15.45%

Vulnerability Summary

CVE-2006-6421: 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.

Impacted Vendors

phpbb 1

phpbb_group 1

Reference Links

http://secunia.com/advisories/23283 http://securityreason.com/securityalert/2005 http://www.phpbb.com/phpBB/viewtopic.php?f=14&t=489624 http://www.securityfocus.com/archive/1/453774/100/0/threaded http://www.securityfocus.com/archive/1/456579/100/0/threaded http://www.securityfocus.com/archive/1/456728/100/100/threaded http://www.securityfocus.com/archive/1/456784/100/100/threaded http://www.securityfocus.com/bid/21806 http://www.securityfocus.com/bid/22001 https://exchange.xforce.ibmcloud.com/vulnerabilities/30776 http://secunia.com/advisories/23283 http://securityreason.com/securityalert/2005 http://www.phpbb.com/phpBB/viewtopic.php?f=14&t=489624 http://www.securityfocus.com/archive/1/453774/100/0/threaded http://www.securityfocus.com/archive/1/456579/100/0/threaded http://www.securityfocus.com/archive/1/456728/100/100/threaded http://www.securityfocus.com/archive/1/456784/100/100/threaded http://www.securityfocus.com/bid/21806 http://www.securityfocus.com/bid/22001 https://exchange.xforce.ibmcloud.com/vulnerabilities/30776

CVSS v2.0

Source Entity [email protected]

Severity MEDIUM

6.0

Access Vector

N/A

Authentication

N/A

RAW VECTOR AV:N/AC:M/Au:S/C:P/I:P/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2006-6421 Exploits & PoCs (Proof Of Concept)

Exploit-DB https://www.exploit-db.com/exploits/29442

View Code

June 16, 2026 MODIFIED

Vulnerability data updated via NVD.

April 23, 2026 MODIFIED

Vulnerability data updated via NVD.

April 09, 2025 MODIFIED

Vulnerability data or affected products updated.

December 10, 2006 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector N/A

Complexity N/A

Privileges N/A

Interaction NONE

CVSS Vector String


                                    AV:N/AC:M/Au:S/C:P/I:P/A:P

Affected Stack

No specific products linked.