[typo] Typo 5.0.4 beta 2 is out, fixes a critical security vulnerability

[Michel R Vaillancourt]

de Villamil Frédéric wrote:
> Michael Morin has discovered a critical vulnerability in Typo priori 
> to release 5.0.4.98.1 which may lead to arbitrary code execution and 
> privilege escalation on Typo blogs. Even though 5.0.4b1 was released 
> yesterday, this vulnerability is critical enough to make us release 
> 5.0.4b2 today.
    Hello, Frédéric!  For those of us who are relatively new to Typo, is 
there a "best practice" for upgrading an existing Typo-based blog?

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