Simone Biles, Serena Williams, and Venus Williams faced some serious scrutiny yesterday afternoon after documents from the World Anti-Doping Agency’s athlete database became public, revealing their private medical records.

Russian computer hackers reportedly managed to acquire and publish medical information that revealed that Biles, and both Williams sisters were given medical exemptions to take drugs that are on WADA’s banned list. The documents also reveal that Biles tested positive for Ritalin.

While the International Gymnastics Federation declined to comment on the leak, Biles took to Twitter to defend herself and to point out that there was no intentional misuse of the drug which is used to treat ADHD.

“WADA deeply regrets this situation and is very conscious of the threat that it represents to athletes whose confidential information has been divulged through this criminal act,” said Olivier Niggli, Director General of the WADA, in a statement. “We are reaching out to stakeholders, such as the IOC, IFs and NADOs, regarding the specific athletes impacted,” he continued.

The leak, which is attributed to the Russian hacking group “Fancy Bear,” comes just months after several Russian Olympic athletes were caught up in a doping scandal of their own. Hackers from “Fancy Bear” are also threatening to release more athlete’s private medical records.

Meanwhile, Biles has received an outpouring of support from fans, many of whom praised her for unabashedly talking about dealing with ADHD.