Dentsu 2023 Data Breach
ObscureIQ Breach Intelligence
High SeverityWebsite / service breach
Dentsu Ad Agency Breach (2023): SSN & Home Address of 13K Employees Exposed
Global advertising, media, and digital transformation company.
Verified by ObscureIQ Intelligence
65/100Breach Risk Index
27Data Value
25Market Recency
508dSince Breach
Breach Intelligence Summary
Entity: Dentsu · Actor: Unverified - PAUSED for user triage · Sources: 2 references
Attack: Unknown
Profile: Company · Advertising, media, and identity-enabled marketing services · Global agency network with data and identity solutions · Japan
Timeline: Breach (2023-05-31) · Indexed (Dec 05, 2024) · Year (2023)
Exposure: 13K records · 4 fields: Full Name, Phone Number, Physical Address, Social Security Number
Status: Reported
Executive Summary
🛑 [PAUSED]
ObscureIQ assessment: High risk because ad and identity data is already structured for segmentation and targeting. Exposure can enable profiling, client impersonation, campaign abuse, and large-scale people-targeting.
Breach Impact
[PAUSED]
About Dentsu
[PAUSED]
Why They Hold Your Data
Global advertising and identity-enabled marketing firms collect client, campaign, audience, identity-resolution, and partner data across advertising, measurement, and targeting operations.
Recent Developments
[PAUSED]
Data Points Exposed
4 verified field types
Full Name High
Phone Number
Physical Address High
Social Security Number Critical
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:
- Identity theft and synthetic identity construction using government-issued IDs
- SIM swap attacks where phone numbers are present
- Doxxing risk from physical address exposure
Threat vectors:
- Name-based social engineering
- SIM swapping, vishing & SMS phishing
- Physical stalking, mail fraud & identity verification
- Home targeting, stalking & physical threat
- Full identity theft & synthetic identity fraud
Threat Actor: Unverified - PAUSED for user triage
Unverified - PAUSED for user triage
Unknown
Attribution and method are based on available breach intelligence. Reported attack vector: Unknown.
Recommended Actions
If you believe your information may be included:
Protect Your ID Documents
Government-ID exposure enables document fraud — monitor and report misuse.
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 Dentsu breach?▾
🛑 [PAUSED]
What data was exposed?▾
Verified fields include Full Name, Phone Number, Physical Address, Social Security Number.
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
ObscureIQ Intelligence
ObscureIQ proprietary analysis
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