For further information on the issue in extension "Calendar Base" (cal),
please read the related advisory TYPO3-SA-2009-019 that was published
today:
http://typo3.org/teams/security/security-bulletins/typo3-sa-2009-019/
For further information on the issue in extension "Direct Mail"
(direct_mail), please read the related advisory TYPO3-SA-2009-018 that
was published today:
http://typo3.org/teams/security/security-bulletins/typo3-sa-2009-018/
For further information on all CSB (Collective Security Bulletin) issues,
please read the related advisory TYPO3-SA-2009-017 that was published
today:
http://typo3.org/teams/security/security-bulletins/typo3-sa-2009-017/
In general the TYPO3 Security Team recommends to read the following pages:
The TYPO3 Security Cookbook:
http://typo3.org/fileadmin/security-team/typo3_security_cookbook_v-0.5.pdf
Make sure you are subscribed to the TYPO3 Announce List:
http://lists.typo3.org/cgi-bin/mailman/listinfo/typo3-announce
See all TYPO3 security advisories.