Joomla! before 1.0.11 does not properly unset variables when the input data includes a numeric parameter with a value matching an alphanumeric parameter's hash value, which allows remote attackers to have an unspecified impact. NOTE: it could be argued that this vulnerability is due to a bug in the unset PHP command (CVE-2006-3017) and the proper fix should be in PHP; if so, then this should not be treated as a vulnerability in Joomla!.

References

• https://nvd.nist.gov/vuln/detail/CVE-2006-4466
• http://www.joomla.org/content/view/1841/78/
• http://www.vupen.com/english/advisories/2006/3408