Data breaches → CodeStepByStep
Was your data in the CodeStepByStep breach?
2025 · codestepbystep.com · ~103,077 accounts exposedLow severity · 3/10
CodeStepByStep (codestepbystep.com) suffered a data breach in 2025 that exposed around 103,077 accounts. If you had an account, some of your personal data may be circulating in leaked databases. The fastest way to know is to check your own email — free, in about 30 seconds, no password required.
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.
Breach details sourced from Have I Been Pwned, the industry-standard breach database. Risk analysis by Nullivo.
What was exposed, and why it matters
Not all breaches carry the same risk — what matters is which fields leaked. Here is what the CodeStepByStep breach exposed and what each item actually enables:
Links this leak to your other accounts — a reused username lets anyone build a profile of you across platforms.
Puts you on spam and phishing lists, and confirms to attackers that you hold an account with this service — which makes impersonation emails more believable.
Also listed in this breach: Email addresses, Names, Usernames.
What to do if you were affected
These steps are ordered for this specific breach — the most urgent action given what leaked comes first.
- Names and usernames: Search your usual username to see what else it exposes, and use distinct handles for sensitive accounts.
- Email addresses: Treat any message referencing this service with suspicion, and never act on links in unexpected emails.
- Check whether your own email appears in this breach — run a free scan to confirm before you spend time on the steps above.
How urgent is this now?
This breach is recent, so the data is actively traded and the risk is at its highest right now.
Remember: a breach can't be "un-leaked" — once a database is out, it exists in countless copies. The goal is to make the leaked data useless: change what can be changed, lock down what can't, and remove what has been republished.
Frequently asked questions
What data was exposed in the CodeStepByStep breach?
The CodeStepByStep breach exposed names and usernames, email addresses. Links this leak to your other accounts — a reused username lets anyone build a profile of you across platforms.
How many people were affected by the CodeStepByStep breach?
Around 103,077 accounts were exposed, making it a mid-sized breach.
What should I do if I had a CodeStepByStep account?
Search your usual username to see what else it exposes, and use distinct handles for sensitive accounts. You can check whether your own email appears in this breach with a free Nullivo scan — no password required.
Breaches that exposed similar data
If the CodeStepByStep breach affected you, these breaches exposed comparable information — worth checking too, since leaked datasets are routinely combined.
- Was your data in the Dragonica Lunaris breach? (2025, ~126,293 accounts)
- Was your data in the TehetségKapu breach? (2025, ~54,357 accounts)
- Was your data in the TISZA Világ breach? (2025, ~198,520 accounts)
- Was your data in the LandAirSea breach? (2025, ~337,373 accounts)
- Was your data in the International Kiteboarding Organization breach? (2025, ~340,349 accounts)
- Was your data in the Infinite Campus breach? (2026, ~137,123 accounts)