For further information on the issue in the extension "mm_forum" (mm_forum), please read the related advisory TYPO3-SA-2010-007 that was published
today:
http://typo3.org/teams/security/security-bulletins/typo3-sa-2010-007/
For further information on all CSB (Collective Security Bulletin) issues,
please read the related advisory TYPO3-SA-2010-006 that was published
today:
http://typo3.org/teams/security/security-bulletins/typo3-sa-2010-006/
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:https://typo3.org/help/security-advisories