Lumin PDF 2019 Data Breach
Platform · Document editing and collaboration · SaaS PDF tools · Global
Lumin PDF Document Collaboration Tool Breach (2019): 24 Million User Accounts Including Auth Tokens & Passwords Exposed
Online PDF editing and collaboration tool.
Confirmed · ObscureIQ Intelligence
Breach Risk Index i
23/100
Lower riskHigher risk
Lower: limited current risk based on data value and recency.
Data Sensitivity i
StandardExposed data is largely lower-sensitivity. Standard identity-protection precautions are advised.
24.4MRecords
2019Year
The Breach Risk Index (BRI) is a proprietary 0–100 score rating how dangerous a breach is right now, based on how recently the data has been circulating on the dark web and how valuable it is to attackers.
Breach Summary
In April 2019, a MongoDB instance in Lumin PDF testing infrastructure was accessed by a third party and, after the company reportedly ignored notifications, the data was posted to a hacking forum in September 2019. The dump contained roughly 24.3 million email addresses (about 15.4 million unique) along with names, genders, spoken languages, usernames, and either a bcrypt password hash or a Google authentication token.
Full threat analysis, exploitation vectors, and principal guidance below.
10 additional sections · verified field analysis · defensive doctrine
Querying breach corpus…
Cross-referencing exposed field types…
Resolving threat-actor attribution…
Compiling principal risk advisory…
24.4M records analyzed
About Lumin PDF
Lumin PDF is a cloud-based PDF editing and document-management service that integrates with Google Drive, used by individuals and businesses to view, annotate, and collaborate on documents.
Why They Hold Your Data
Document-editing platforms collect user accounts, emails, billing records, document metadata, collaboration history, and cloud-linked access records across PDF workflows.
Recent Developments
Lumin PDF continued operating after the incident. Reporting indicated the company was notified of the exposed database multiple times before the data was ultimately leaked publicly.
Data Points Exposed
7 verified field types
Authentication Token High
Email Address
Full Name
Gender
Password High
Spoken Language
Username
Breach Impact
Exposure of Google auth tokens alongside account details created session/account-takeover risk for linked Google Drive access, compounding standard credential-reuse exposure.
Exploitation & Downstream Threats
• Credential stuffing against reused passwords across other platforms | • Targeted phishing campaigns using exposed email addresses
Principal Risk Advisory
What this means for a principal
A consumer-service breach: contact and account data supports phishing, account takeover and profile enrichment. For a high-profile principal the main risk is credible impersonation and enrichment of existing exposure.
What You Should Do
- Reset any reused passwords and enable MFA on email first, then financial accounts.
- Do not use unofficial 'am I affected' lookups; several are themselves harvesting operations.
How ObscureIQ Can Help
- Corpus confirmation: determine whether and where the principal (plus household and staff) appear in this dataset and which specific fields are exposed for them.
- Exposure mapping: cross-reference the exposed identifiers against broker-available data to size and prioritize the principal's wider footprint.
- ThreatWatch tuned to this incident's identifiers and misuse pattern (impersonation and targeting patterns, not generic credential monitoring).
Protect Yourself
Check If You're Affected
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