Yes, as I mention in the blog post, I've attempted to contact this security list and a couple members on the core team through their individual email accounts over a week ago. I've only received one response last Thursday that someone would look into it, but the issue seemed to die there.
Now that enough time has been given for the security list to look into the problem (and hopefully not ignore it), the best practice I thought would be to tell as many people as possible about it so the fix can be applied and publicized. I felt I'd get a lot bigger audience here at Hacker news than the rails bug tracker. The bigger the audience the more people that can get their Rails 2.3 instances fixed if they are effected and avoid a problem. I was also planning on posting it there, but feel free to do it as well.