Over the weekend, there was an attack on Stack Overflow. We have confirmed that some level of production access was gained on May 11. We discovered and investigated the extent of the access and are addressing all known vulnerabilities. We have not identified any breach of customer or user data. Our customers’ and users’ security is of the utmost importance to us. After we conclude our investigation cycle, we will provide more information.
Update: We shared a post on 5/17/19 with new information.