The ChangeLog for phpBB 2.0.11 states:
Changes since 2.0.10
- Fixed vulnerability in highlighting code (very high severity, please update your installation as soon as possible)
- Fixed unsetting global vars - Matt Kavanagh
- Fixed XSS vulnerability in username handling - AnthraX101
- Fixed not confirmed sql injection in username handling - warmth
- Added check for empty topic id in topic_review function
- Added visual confirmation mod to code base
Additionally, a US-CERT Technical Cyber Security Alert reports:
phpBB contains an user input validation problem with regard to the parsing of the URL. An intruder can deface a phpBB website, execute arbitrary commands, or gain administrative privileges on a compromised bulletin board.
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