it's true. but i dont understand ..... any steam services means.....we should not login into our accnt?
Yes. Do not interact with steam. The vulnerability exposes session cookies (along with steamguard authorization cookies).
You might wanna provide (a lot) more details about this, as well as your source of information.
I did. The source is from SteamDB (reputable website) and the bug was discovered by security researchers (one of them works for Google). Here's also a relevant discussion on HackerNews if you're into the technical side of things. And here's a tool to check for vulnerable websites.
From what I understood, it seems to affect more than just steam, but it also doesn't just happen, it needs to be a targeted attack or something like that.
In any case, I guess it's better to be safe than sorry. But I'll continue to read more about this since the technical aspect of it is interesting.
Thanks for the information.
Edit: I found this article about the issue on SoftPedia in case anyone interested in further read.
Fixed now