Wiener Büchereien 2019 Data Breach
Government entity · Public library services · Municipal library system · Austria
Wiener Büchereien Vienna Public Library System Breach (2019): 224K User Accounts Including Passwords Exposed
Public library system in Vienna.
Confirmed · ObscureIQ Intelligence
Breach Risk Index i
22/100
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.
224KRecords
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.
Crucial data exposed
AddressPhysical address
Breach Summary
In June 2019, the Vienna public library system (Wiener Büchereien) was breached, and 224,000 unique email addresses along with names, physical addresses, phone numbers, and dates of birth were posted to Twitter. The hacker published the data after the city and libraries did not respond to warnings about the exposure.
Full threat analysis, exploitation vectors, and principal guidance below.
9 additional sections · verified field analysis · defensive doctrine
Querying breach corpus…
Cross-referencing exposed field types…
Resolving threat-actor attribution…
Compiling principal risk advisory…
224K records analyzed
About Wiener Büchereien
Wiener Büchereien is the public library system of the city of Vienna, Austria.
Why They Hold Your Data
Municipal library systems collect patron identity, contact details, borrowing history, account records, fines, and program-participation data across public library services.
Data Points Exposed
5 verified field types
Date of Birth High
Email Address
Full Name
Phone Number
Physical address High
Breach Impact
The identity and contact data with DOB supports profiling and targeted phishing of library patrons; no passwords were exposed.
Exploitation & Downstream Threats
• Identity verification bypass using name + date of birth combination | • SIM swap attacks where phone numbers are present | • Targeted phishing campaigns using exposed email addresses | • Doxxing risk from physical address exposure
Principal Risk Advisory
What this means for a principal
A government-linked breach: official identifiers and citizen records support identity fraud and credible authority-impersonation. For a high-profile principal this is targeting-grade, not merely identity-theft-grade: the combination lets an adversary locate, impersonate, or pressure the principal with little additional work.
What You Should Do
- Treat the home address as exposed: review mail and package handling and physical-security routines, and brief household staff to verify unusual requests.
- Guard against SIM-swap and vishing: add a carrier port-out PIN and verify any 'support' calls independently.
- 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 and footprint neutralization: cross-reference against broker-available data and suppress still-removable elements, prioritizing address and phone, since this record re-seeds broker networks.
- ThreatWatch tuned to this incident's identifiers and misuse pattern (impersonation and targeting patterns, not generic credential monitoring).
Protect Yourself
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