Multiple security issues have been discovered in extensions pdf_generator2, pmkshadowbox and pmkslimbox
For further information on the issues in extension pdf_generator2, please read the related advisory TYPO3-EXT-SA-2011-016 that was published today:
http://typo3.org/teams/security/security-bulletins/typo3-extensions/typo3-ext-sa-2011-016/
For further information on the issues in extensions pmkshadowbox and pmkslimbox, please read the related advisory TYPO3-EXT-SA-2011-015 that was published today:
http://typo3.org/teams/security/security-bulletins/typo3-extensions/typo3-ext-sa-2011-015/
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:
http://typo3.org/teams/security/security-bulletins/