CentOS Errata and Security Advisory CESA-2011:1438
Mozilla Thunderbird is a standalone mail and newsgroup client.
All Thunderbird users should upgrade to this updated package, which resolves this issue. All running instances of Thunderbird must be restarted for the update to take effect.
Merged security bulletin from advisories: http://lists.centos.org/pipermail/centos-announce/2011-November/018183.html http://lists.centos.org/pipermail/centos-announce/2011-November/018184.html http://lists.centos.org/pipermail/centos-announce/2011-November/018189.html http://lists.centos.org/pipermail/centos-announce/2011-November/018190.html
Affected packages: thunderbird
Upstream details at: https://rhn.redhat.com/errata/RHSA-2011-1438.html