Yam 2013 Data Breach
ObscureIQ Breach Intelligence
Low SeverityWebsite / service breach
Yam.com Taiwanese Web Portal Breach (2013): 13 Million User Accounts Including Passwords, Phone & Home Address Exposed
Taiwanese web portal and community platform.
Verified by ObscureIQ Intelligence
19/100Breach Risk Index
10Data Value
10Market Recency
1873dSince Breach
Breach Intelligence Summary
Entity: Yam · Actor: Unknown · Sources: 4 references
Attack: Unknown
Profile: Platform · Web portal, community, and digital content services · Portal and community platform · Taiwan
Timeline: Breach (2013-06-02) · Indexed (May 22, 2021) · Year (2013)
Exposure: 13.3M records · 7 fields: Date of Birth, Email Address, Full Name, Password, Phone Number, Physical Address, Username
Status: Confirmed
Executive Summary
In June 2013, the Taiwanese web portal Yam (yam.com) suffered a data breach that was shared on a hacking forum in 2021, exposing about 13.3 million unique email addresses. Exposed data included usernames, names, phone numbers, physical addresses, dates of birth, and passwords stored as unsalted MD5 hashes.
ObscureIQ assessment: Exposure enables account takeover, phishing, and identity linkage through community participation and content behavior. Portal-style data may also widen correlation across multiple services.
Breach Impact
The combination of names, dates of birth, addresses, and phone numbers with crackable MD5 passwords supports identity fraud and credential stuffing across a Taiwanese user base.
About Yam
Taiwanese web portal and community platform.
Why They Hold Your Data
Portal and community platforms collect user accounts, emails, profile data, content-engagement records, and social activity tied to web services and online communities.
Data Points Exposed
7 verified field types
Date of Birth High
Email Address
Full Name High
Password Critical
Phone Number
Physical Address High
Username
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:Moderate
Primary 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
Threat vectors:
- Identity verification bypass
- Phishing, credential stuffing & account takeover
- Name-based social engineering
- Credential stuffing & account takeover
- SIM swapping, vishing & SMS phishing
- Physical stalking, mail fraud & identity verification
- Cross-platform tracking & credential stuffing
Recommended Actions
If you believe your information may be included:
Change Reused Passwords
Update this account and anywhere you reused the password; use a manager.
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 Yam breach?▾
In June 2013, the Taiwanese web portal Yam (yam.com) suffered a data breach that was shared on a hacking forum in 2021, exposing about 13.3 million unique email addresses. Exposed data included usernames, names, phone numbers, physical addresses, dates of birth, and passwords stored as unsalted MD5…
What data was exposed?▾
Verified fields include Date of Birth, Email Address, Full Name, Password, Phone Number, Physical Address, Username.
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
BreachForums_Official_Index
ObscureIQ Intelligence
ObscureIQ proprietary analysis
Protect Yourself
Check If You're Affected
Enter your email to check whether your data appears in this breach. We’ll send a 6-digit code to confirm it’s your address.
Get Free Breach Alerts
Be the first to know when new breaches are disclosed. Free forever — confirm your email with a 6-digit code.
High-Risk? Get an Exposure Audit
Executives, public figures, and high-visibility operators can receive tailored exposure intelligence and hardening guidance.
Request Consultation