The POODLE vulnerability in TLS/SSL could have allowed a man-in-the-middle attacker to read encrypted forum traffic. For example, Tor exit nodes could have used this attack against anyone using Tor to access the forum. I disabled SSLv3 to prevent this attack in the future, and I logged everyone out to invalidate any possibly-compromised cookies. If you used a proxy or ISP that you don't absolutely trust to access the forum, then you should also change your password.
Most other sites are similarly affected.
I suggest that in the future, you make the "News: Due to a recently..." sentence clickable, and link to a post or an arcticle mentioning what it is all about.
It would save time for anybody that didn't see any news about that yet and who is curious at what exactly the attack/issue entails (outside of bitcointalk).