Cit0day Leak Exposes 226M Email‑Password Pairs from Over 23,000 Websites
What Happened – A data set containing 226,883,414 unique email‑address and password pairs was posted on multiple hacking forums in November 2020. The collection, dubbed “Cit0day,” aggregates credentials from more than 23,000 previously undisclosed website breaches, including both password hashes and cracked plaintext passwords. The breach was verified by independent researchers and supplied to Have I Been Pwned (HIBP) by dehashed.com.
Why It Matters for Trust & Control Assurance
- Demonstrates the risk of unmanaged credential exposure – a scenario continuous control‑assurance programs aim to detect, document, and remediate.
- Highlights the need for robust identity‑and‑access controls (password policies, MFA, credential‑monitoring) that can be evidenced in audit trails.
- Provides a real‑world data point for third‑party risk assessments, showing how weak credential hygiene can cascade across supply‑chain partners.
Who Is Affected – Any organization that stored user credentials on web‑based services, notably SaaS providers, e‑commerce platforms, financial‑service portals, and other online businesses that rely on password‑based authentication.
Recommended Actions
- Force password rotation for all accounts that may appear in the dump and enforce strong password complexity.
- Deploy multi‑factor authentication (MFA) wherever possible to mitigate credential reuse.
- Activate continuous credential‑exposure monitoring to receive alerts when employee or customer credentials surface in public leaks.
- Review and harden password storage practices (e.g., salted bcrypt/argon2 hashing).
- Document remediation steps and retain evidence for audit readiness.
Technical Notes – The leak aggregates data from dozens of unrelated breaches; no single CVE is associated. Attack vector appears to be credential theft from compromised web applications, likely via weak password policies or credential stuffing. Exposed data includes email addresses and both hashed and plaintext passwords. Source: HIBP breach record