CodeStepByStep Data Breach

What happened

In November 2025, the online coding practice tool CodeStepByStep suffered a data breach that exposed 17k records which were subsequently published online. The following month, a further corpus of data was released bringing the total to 103k. The impacted data included names, usernames and email addresses.

Exposed data

Recommended actions

• Watch for targeted phishing emails referencing CodeStepByStep — attackers weaponise breach data quickly.
• Check whether your email address appears in this breach on haveibeenpwned.com.