Joomla released Joomla! 3.4.5 version yesterday. This is a security release for the 3.x series of Joomla which addresses a critical security vulnerability. Joomla! team strongly recommend that all Joomla! user should upgrade their site immediately. This release only contains the security fixes; no other changes have been made compared to the Joomla 3.4.4 release.
What's in 3.4.5
Version 3.4.5 is released to address three reported security vulnerabilities and includes additional security hardening of the UploadShield system.
Security Issues Fixed