LinkedIn 2021 Data Breach
ObscureIQ Breach Intelligence
Low SeverityWebsite / service breach
LinkedIn Professional Network Data Scrape (2021): 400 Million Public Profile Records Including Phone, Job Title & Home Address Sold Online
Professional networking platform.
Verified by ObscureIQ Intelligence
23/100Breach Risk Index
5Data Value
25Market Recency
512dSince Breach
Breach Intelligence Summary
Entity: LinkedIn · Actor: Unknown · Sources: 10 references
Attack: Misconfiguration
Profile: Platform · Professional networking and recruiting · Social platform + hiring marketplace · Global
Timeline: Breach (2012-05-05) · Indexed (Dec 01, 2024) · Year (2021)
Exposure: 400.1M records · 9 fields: Education Information, Email Address, Full Name, Gender, Geographic Location, Job Information, Phone Number, Physical Address, Social Media Profile
Status: Confirmed
Executive Summary
LinkedIn suffered one of the largest professional profile exposures on record when attackers scraped data from approximately 400 million user accounts in early 2021 and sold the aggregated dataset on hacker forums. The incident was not a conventional database breach. Instead, attackers harvested publicly visible profile information, likely through automated access to LinkedIn's platform and APIs, in violation of the platform's terms of service. LinkedIn stated that the dataset drew from multiple sources and did not expose private account data, though the scale and sensitivity of what was compiled told a different story. The exposed data included names, email addresses, phone numbers, job titles, geographic locations, education history, genders, and links to social media profiles. Phone numbers and home addresses are not typically public on LinkedIn, raising concerns that some fields were extracted through API enumeration rather than simple profile scraping. Packaged together, this information creates a detailed professional identity profile for hundreds of millions of people, ready-made for targeted phishing, impersonation, fraud pretexting, and business relationship mapping at scale. LinkedIn filed a federal lawsuit in February 2022 against Mantheos Pte. Ltd., a Singapore-based company accused of scraping and reselling member data. The case settled in May 2022. Mantheos agreed to a permanent restraint from the practice but admitted no liability and paid no monetary compensation. No broad regulatory action was publicly reported. Affected individuals face elevated risk of spearphishing, executive-targeted scams, and business email compromise attacks, since the dataset gives bad actors detailed context to craft convincing, personalized outreach.
ObscureIQ assessment: High risk of spearphishing, impersonation, and business relationship mapping. Employment and network data make targeted scams, executive targeting, and BEC-style attacks much more effective.
Breach Impact
The 2021 LinkedIn incident is best described as a large scraping event, not a conventional internal system breach. Public reporting from HIBP says attackers scraped data from hundreds of millions of public profiles and monetized it later, while LinkedIn’s public position was that the dataset was an aggregation of data from multiple sources and did not expose private member account data. Even so, the exposure was still significant because it packaged names, emails, job titles, locations, and related profile data into a ready-made corpus useful for phishing, impersonation, spam targeting, fraud pretexting, and professional identity mapping at scale.
About LinkedIn
LinkedIn is a professional networking platform centered on work identity, career history, recruiting, business relationships, and professional publishing. Since Microsoft acquired it in 2016, it has operated as a large-scale employment and professional graph that serves job seekers, recruiters, advertisers, sales teams, and enterprise customers.
Why They Hold Your Data
Professional networking platforms collect identity, employment history, education, contact details, social connections, messaging, recruiting activity, and behavioral engagement data across career and hiring workflows.
Recent Developments
LinkedIn continues to position itself as a major AI-enabled talent and professional platform. Public materials and recent Microsoft disclosures point to ongoing product investment around recruiting, learning, and AI-related career tools, while Microsoft reported LinkedIn revenue growth and record engagement in FY25 Q2.
Data Points Exposed
9 verified field types
Education Information
Email Address
Full Name High
Gender
Geographic Location
Job Information
Phone Number
Physical Address High
Social Media Profile
Field names are shown in full for clarity and search visibility. Canonical machine keys are emitted only in this page’s structured data.
Exploitation & Downstream Threats
Threat Activity:High
Primary downstream threats:
- SIM swap attacks where phone numbers are present
- Targeted phishing campaigns using exposed email addresses
- Doxxing risk from physical address exposure
- Employment-based social engineering using job and employer data
- Social media account targeting and impersonation
Threat vectors:
- Credential fraud & spear-phishing
- Phishing, credential stuffing & account takeover
- Name-based social engineering
- Profile enrichment
- Pattern-of-life analysis & physical surveillance
- Vishing & authority impersonation
- SIM swapping, vishing & SMS phishing
- Physical stalking, mail fraud & identity verification
- Home targeting, stalking & physical threat
- Account impersonation & social graph harvesting
Recommended Actions
If you believe your information may be included:
Enable MFA Everywhere
Turn on multi-factor authentication on email first, then financial accounts.
Report & Recover
If you spot misuse, start an official recovery plan and report fraud.
Frequently Asked Questions
What happened in the LinkedIn breach?▾
LinkedIn suffered one of the largest professional profile exposures on record when attackers scraped data from approximately 400 million user accounts in early 2021 and sold the aggregated dataset on hacker forums. The incident was not a conventional database breach. Instead, attackers harvested…
What data was exposed?▾
Verified fields include Education Information, Email Address, Full Name, Gender, Geographic Location, Job Information, Phone Number, Physical Address, Social Media Profile.
What should I do if I was affected?▾
Change reused passwords, enable MFA, and (if identity or financial data is involved) freeze your credit and monitor your accounts.
Sources & References
Every claim on this page is traceable. This breach draws on:
Breach Index
Breach Index
Cross-source
9ghz
Cross-source
BreachAware
Cross-source
BreachForums_Official_Index
Cross-source
DataViper.io
Cross-source
Dehashed
Cross-source
Hashes.org
Cross-source
Siphon
ObscureIQ Intelligence
ObscureIQ proprietary analysis
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