phpMyAdmin is a tool written in PHP intended to handle the administration of MySQL databases from a web-browser.
Oriol Torrent Santiago has discovered that phpMyAdmin fails to validate input to the "convcharset" variable, rendering it vulnerable to cross-site scripting attacks.
By sending a specially-crafted request, an attacker can inject and execute malicious script code, potentially compromising the victim's browser.
There is no known workaround at this time.
All phpMyAdmin users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-db/phpmyadmin-2.6.2_rc1"