KomikoAI komiko.app KomikoAI data breach: what happened and what to do
In February 2026, AI comic generator KomikoAI suffered a breach exposing about 1 million email addresses with names, user posts and the AI prompts people typed. Have I Been Pwned added 1,060,191 accounts in March 2026.
View all 13,115 breaches- Breach date
- 25 Feb 2026
- Affected
- 1,060,191
- Data exposed
- AI prompts, Email addresses, Forum posts, Names
- Verified
- Yes
- Last updated
Source: Have I Been Pwned (CC BY 4.0)
What happened
KomikoAI is a platform that turns text prompts into comics. In February 2026 it suffered a data breach. Have I Been Pwned (HIBP) dates the incident to 25 February 2026 and added it on 2 March 2026. HIBP counted 1,060,191 accounts, with about 1 million unique email addresses.
HIBP's entry is short. It does not describe how the data was taken or what the company said. The entry's main point is what the data contains, and one detail stands out.
What was exposed
HIBP lists these data types:
- Email addresses
- Names
- Forum posts (user posts on the platform)
- AI prompts
The prompts are the unusual part. HIBP notes that the exposed data lets someone map individual AI prompts to specific email addresses. In other words, what you typed into the tool can be tied to who you are.
Passwords are not listed in HIBP's entry.
Why prompts matter
People treat AI tools like a private notebook. They type story ideas, names of real friends, family jokes, work details and sometimes things they would not post publicly. For a comic generator, prompts may describe characters based on real people.
When prompts are linked to an email address, a few things become possible:
- Embarrassment and pressure. Anyone who gets the data can read what you asked for and see your name next to it. That opens the door to blackmail attempts or public shaming, even over harmless prompts.
- Targeted phishing. A message that quotes your own prompt, or mentions comics you made, is much more convincing than generic spam.
- Profiling. Prompts reveal interests and relationships. Combined with a name and email, they help someone build a profile of you.
Most of that is about how the data could be used, not about anything confirmed to have happened. HIBP records what was exposed, not what criminals did with it.
The company's response
The HIBP entry doesn't include a notice from KomikoAI, and the sources used for this page don't either. If you have an account, look in your inbox for any email from the company and be wary of any message that asks you to log in via a link.
What to do about prompts you can't unsend
You can't get a prompt back after it has leaked. Think about what you typed into KomikoAI and assess the worst case. If you included real names, workplaces or private details about other people, think about whether those people should know. Going forward, treat any AI tool as something that could leak: don't type anything you'd be unable to explain if it appeared under your name.
What to do if you were in it
- 1
Review what you typed into KomikoAI
Think about prompts that included real names, workplaces or private details. If other people are named, consider warning them.
- 2
Change your password and turn on two-factor login
HIBP doesn't list passwords here, but changing it is cheap. Do the same on any account that used the same password, and turn on two-factor login.
- 3
Expect phishing that quotes your activity
A message that mentions your comics or prompts is probably a scam. Don't click links in it; open the app or site yourself.
- 4
Treat blackmail messages as a scam
If someone threatens to expose your prompts unless you pay, don't pay or reply. Keep the message and report it to your local police or a cybercrime reporting service.
- 5
Keep private details out of AI tools
Assume anything you type into an online AI service could leak. Leave out real names, addresses, health or work details unless you need them.
- 6
Check which other breaches include you
Run a free Serus scan to see whether your email or phone number appears in this and other breaches. Serus monitors breach databases and the dark web and alerts you when your details show up in a new leak.
Frequently asked
Was I affected by the KomikoAI breach?
Look up your email address on Have I Been Pwned. If KomikoAI is listed, your email and the other data types in the entry were exposed.
What was exposed?
Email addresses, names, user posts and the AI prompts used to generate content, according to Have I Been Pwned.
Can my prompts be linked to me?
Yes. HIBP notes the data lets individual prompts be mapped to specific email addresses.
Should I change my password?
HIBP doesn't list passwords in this breach, but changing your password and turning on two-factor login is a sensible precaution.
Sources
Something wrong or out of date? Tell us and we'll re-check it.
