Trac is a wiki and issue tracking system for software development projects.
Trac allows users to perform certain tasks via HTTP requests without performing correct validation on those requests.
An attacker could entice an authenticated user to browse to a specially crafted URL, allowing the attacker to execute actions in the Trac instance as if they were the user.
There is no known workaround at this time.
All Trac users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=www-apps/trac-0.10.1"