Lumin PDF
HIGH RISKData breach — April 2019
In April 2019, the PDF management service Lumin PDF suffered a data breach. The breach wasn't publicly disclosed until September when 15.5M records of user data appeared for download on a popular hacking forum. The data had been left publicly exposed in a MongoDB instance after which Lumin PDF was allegedly been "contacted multiple times, but ignored all the queries". The exposed data included names, email addresses, genders, spoken language and either a bcrypt password hash or Google auth token.
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What happened in the Lumin PDF data breach?
In April 2019, the PDF management service Lumin PDF suffered a data breach. The breach wasn't publicly disclosed until September when 15.5M records of user data appeared for download on a popular hacking forum. The data had been left publicly exposed in a MongoDB instance after which Lumin PDF was allegedly been "contacted multiple times, but ignored all the queries". The exposed data included names, email addresses, genders, spoken language and either a bcrypt password hash or Google auth token.
The exposed data included 7 types of personal information. Because passwords were exposed, users who reused their password on other sites are at particular risk. Learn more about what a data breach means for you.
Quick answer — was Lumin PDF hacked?
Yes. Lumin PDF was breached in April 2019. The breach exposed 15,453,048 records including auth tokens, email addresses, genders. This breach has been independently verified. If your email was involved, your data may still be at risk today. Check if you were affected.
Why was the Lumin PDF breach so dangerous?
The Lumin PDF breach exposed 15,453,048 records — that is 15.5M people whose personal data is now circulating on the dark web. The combination of auth tokens, email addresses, genders makes this a high-risk breach that requires immediate action.
Because passwords were exposed, attackers can use credential stuffing to automatically test your Lumin PDF password against hundreds of other websites. If you reused your password anywhere, those accounts are now at risk. Read more about what happens to your data after a breach.
Don't wait to find out — check if your email was exposed in this breach now.
What data was stolen in the Lumin PDF breach?
Auth tokens — may be combined with other breach data to build a profile for targeted attacks
Email addresses — used for phishing attacks and credential stuffing against your other accounts
Genders — may be combined with other breach data to build a profile for targeted attacks
Names — used to build profiles and target you with personalised scams
Passwords — can be used to access your accounts directly or cracked to reveal your actual password
Spoken languages — may be combined with other breach data to build a profile for targeted attacks
Usernames — used to build profiles and target you with personalised scams
Is the Lumin PDF breach still dangerous in 2026?
Yes. Stolen data from the Lumin PDF breach remains dangerous years after the incident. Research shows that over 65% of stolen credentials from older breaches have never been changed by the account holders. Attackers routinely compile data from multiple breaches to build complete profiles, and credentials from 2019 are still actively used in credential stuffing attacks today.
Personal information like email addresses, phone numbers, and dates of birth never expire. Even if you changed your Lumin PDF password, the other exposed data can be combined with information from other breaches to target you. Learn more about how long stolen data stays dangerous.
Frequently asked about the Lumin PDF breach
Approximately 15,453,048 user records were exposed in the Lumin PDF breach in April 2019.
Yes. Leaked credentials are actively used in credential stuffing attacks years after a breach. If you reused your Lumin PDF password elsewhere and haven't changed it, those accounts remain at risk today.
Enter your email in the free checker on EmailLeaked. We scan 12 billion+ breach records including the full Lumin PDF dataset and tell you instantly whether your email was exposed and what data was taken.
Change your Lumin PDF password immediately, change any other account where you used the same password, enable two-factor authentication on all important accounts, and monitor for phishing emails over the next 90 days.
Who was affected by the Lumin PDF breach?
The Lumin PDF data breach affected approximately 15,453,048 users who had accounts with the service. With 15.5M records exposed, this is one of the larger breaches tracked in our database of 970+ known breaches.
If you ever created an account with Lumin PDF or used their services, your data may have been included in this breach. Check your email now to find out. You can also read our guide on what to do immediately after a data breach.
If your email was in the Lumin PDF breach
Change your Lumin PDF password immediately
Go to Lumin PDF and change your password right now. Use a strong, unique password that you have never used anywhere else.
Change any account sharing that password
If you used the same password on other sites, change it on every one of them. Attackers test stolen credentials on hundreds of popular sites within hours.
Enable two-factor authentication
Turn on 2FA on Lumin PDF and every important account. Even if your password is known, attackers cannot get in without the second factor.
Check your other accounts for this breach
Run a full email check to see every breach your email appears in — not just this one.
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