CodeStepByStep data breach: 103K accounts exposed
Severity: medium · Patch status: no-fix-needed · Since 2025-11-23
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: email addresses, names, usernames. The breach dates from Nov 15, 2025; Have I Been Pwned loaded it on Nov 23, 2025.
What to do
- If you had a CodeStepByStep account, change its password and the password of any other account that reused it.
- Turn on multi-factor authentication wherever it is offered.
- Check whether your addresses are in this breach at https://haveibeenpwned.com.
Sources
All live incidents on Threat Watch