August 18, 2015

Ashley Madison user data leaked

The Impact Team published a 9.7 GB dump of Ashley Madison customer data on August 18, 2015 — exposing millions of accounts from the extramarital dating site.

What it was for

Ashley Madison data breachThe Impact Team breach dumped emails, credit cards, and internal source code — demonstrating that even adult sites storing secrets face extortion and reputational ruin. It accelerated debates over data retention, bcryptA password hashing function — slow by design to resist brute-force attacks on stolen databases. versus weak hashing, and whether security teams owe duty of care to users engaging in sensitive behavior.

Why it's here

Ashley Madison was the hack that proved no niche site was too embarrassing to target.

Why it mattered

It highlighted weak password storage and destructive hacktivist motives.

What it solved

Nothing for users — it exposed that 'discreet' marketing did not mean secure engineering.

Media

  • Ashley Madison data breach
    ImageAshley Madison data breach

    DVSROSS, CC BY 2.0, via Wikimedia Commons

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