Is twenty-twelve theme affected by XSS Vulnerability?

I’ve just read the recent security advisory about how many plugins are vulnerable to “cross-site scripting” (XSS). I’m using twenty-twelve theme on a couple of my sites. I haven’t been updating the theme version since I didn’t apply a child theme to it. (I know, my bad.) The site is working fine though. That being said, am I really at risk here?

Thanks all.