NetGalley 2020 Data Breach
Books & Publishing / Book Promotion & Reviews / Consumer / Enterprise
NetGalley 2020 Data Breach: 1.4 Million Book-Reviewer Accounts Exposed
Book-promotion and review platform connecting publishers with reviewers.
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
StandardExposed data is largely lower-sensitivity. Standard identity-protection precautions are advised.
1.4MRecords
2020Year
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 December 2020, NetGalley suffered a breach exposing 1.4 million unique email addresses along with names, usernames, physical and IP addresses, phone numbers, dates of birth and passwords stored as salted SHA-1 hashes, after an attacker accessed a database backup following a website defacement.
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…
1.4M records analyzed
About NetGalley
NetGalley is a book-promotion and review platform where publishers offer pre-release digital galleys to reviewers, librarians, booksellers and media in exchange for feedback.
Why They Hold Your Data
A reviewer platform holds member identity and contact data, usernames, physical and IP addresses, phone numbers, dates of birth and hashed account passwords.
Recent Developments
NetGalley disclosed the December 2020 breach after its homepage was defaced and an attacker accessed a backup of its member database.
Data Points Exposed
8 verified field types
Date of Birth High
Email Address
Full Name
IP Address
Password High
Phone Number
Physical address High
Username
Breach Impact
NetGalley reset passwords and notified members; the incident exposed a global base of reviewers and industry professionals.
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
- Treat the home address as exposed: review mail and package handling and physical-security routines, and brief household staff to verify unusual requests.
- Reset any reused passwords and enable MFA on email first, then financial accounts.
- 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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