Estante Virtual 2019 Data Breach

Estante Virtual 2019 Data Breach: 5.4 Million Brazilian Bookstore Customers Exposed

Retail & Commerce / Online Bookstore Marketplace / Consumer / Brazil

Estante Virtual 2019 Data Breach: 5.4 Million Brazilian Bookstore Customers Exposed

Brazilian online marketplace for new and used books.

Confirmed · ObscureIQ Intelligence
Breach Risk Index i
17/100
Lower riskHigher risk
Lower: limited current risk based on data value and recency.
Data Sensitivity i
Standard
Exposed data is largely lower-sensitivity. Standard identity-protection precautions are advised.
5.4MRecords
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.

Crucial data exposed
AddressPhysical address
Classification Tags
Cloud MisconfigurationRetail & CommerceE-commerce2019

Breach Summary

In February 2019, Estante Virtual suffered a breach exposing about 5.4 million customer records, including names, usernames, email and physical addresses, phone numbers, dates of birth and passwords stored as unsalted SHA-1 hashes.

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…

5.4M records analyzed

About Estante Virtual

Estante Virtual is a Brazilian online marketplace for new and used books, connecting buyers with independent booksellers across Brazil.

Why They Hold Your Data

An online bookstore holds customer identity and contact data, usernames, physical addresses, phone numbers, dates of birth and hashed account passwords.

Recent Developments

Estante Virtual continues to operate. The 2019 data later circulated on hacking forums, alongside several other Brazilian sites' datasets.

Data Points Exposed

7 verified field types
Date of Birth High
Email Address
Full Name
Password High
Phone Number
Physical address High
Username

Breach Impact

The breach exposed a large Brazilian consumer base and drew scrutiny under Brazil's LGPD regime.

Exploitation & Downstream Threats

• Credential stuffing against reused passwords across other platforms | • 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 consumer-service breach: contact and account data supports phishing, account takeover and profile enrichment. 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

  1. Treat the home address as exposed: review mail and package handling and physical-security routines, and brief household staff to verify unusual requests.
  2. Reset any reused passwords and enable MFA on email first, then financial accounts.
  3. Guard against SIM-swap and vishing: add a carrier port-out PIN and verify any 'support' calls independently.
  4. Do not use unofficial 'am I affected' lookups; several are themselves harvesting operations.

How ObscureIQ Can Help

  1. Corpus confirmation: determine whether and where the principal (plus household and staff) appear in this dataset and which specific fields are exposed for them.
  2. 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.
  3. ThreatWatch tuned to this incident's identifiers and misuse pattern (impersonation and targeting patterns, not generic credential monitoring).

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