> [!info] > Input: [[Email Address|email address]], [[Phone Number|phone number]], [[Username|username]], [[Name|full name]] > Output: [[Personal Information (PI)|personal information]], [[Login|login credentials]], [[Social Media Account|linked accounts]] > Types: [[Technical Weakness|technical]] > Weakness: [[SOWEL-12. Losing Data to Breaches]] ### Explanation Data breach aggregation services and leaked database repositories allow investigators to search for records associated with a known identifier — typically an email address, phone number, or username. A match can reveal: - **Other accounts**: Email addresses or usernames found in breach records often confirm the existence of accounts on specific platforms, even if those accounts are no longer publicly accessible - **Passwords and password patterns**: Leaked passwords, even if outdated, reveal the person's password construction habits, which can help link accounts (see [[SOTL-6.3. Check Password Reuse to Find Another Account]]) - **Additional personal data**: Depending on the breach, records may include IP addresses, physical addresses, dates of birth, phone numbers, or payment details that were not available through public profiles - **Timeline of activity**: Registration dates and last-login timestamps in breach records help establish when a person was active on a given platform Cross-referencing results from multiple breaches builds a progressively more complete profile. An email found in one breach may reveal a username, which when searched in another breach reveals a phone number, and so on. It is important to note that working with breach data raises legal and ethical considerations that vary by jurisdiction. Investigators should be aware of applicable regulations and ensure their use of such data is lawful and proportionate. ### Examples {{to be filled after research}} ### Tools {{to be filled after research}} ### See also - [[SOTL-6.1. Check Logins Reuse to Find Another Account]] - [[SOTL-6.2. Check Nicknames Reuse to Find Another Account]] - [[SOTL-6.3. Check Password Reuse to Find Another Account]]