Image Credits: Getty Images

Developer knowledge sharing site Stack Overflow has confirmed hackers breached its systems, but said customer data is unaffected.

“Over the weekend, there was an attack on Stack Overflow,” wrote Mary Ferguson, vice president of engineering. “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,” said Ferguson. “We have not identified any breach of customer or user data,” she said.

An investigation into the breach is ongoing.

The company otherwise remained tight-lipped about the breach, its cause and the effect. We’ve sent several questions to the company but did not immediately hear back.

Stack Overflow, founded in 2008, has more than 50 million monthly active users who use the site to share code and knowledge. It remains one of the top 50 most popular sites on the web, according to rankings by internet analytics site Alexa. The company is backed by Andreessen Horowitz and Bezos Expeditions, raising $40 million in its most recent Series D funding round in 2015.

Read more: