Compromised Credentials
Also known as: Stolen credentials, Leaked credentials
Compromised credentials are usernames and passwords that have been exposed to unauthorized parties — frequently through infostealer malware, data breaches, or phishing. Once exposed, they enable account takeover, lateral movement, and fraud, especially when reused across services.
What are compromised credentials?
A credential is compromised when its username/password pair is in the hands of someone unauthorized to have it. Credentials become compromised through infostealer infections, breaches of online services, phishing, and credential dumps. Infostealers are an especially potent source because they capture credentials in plaintext directly from the browser.
Why compromised credentials are dangerous
Password reuse multiplies the damage: one compromised credential can unlock many accounts. Attackers feed compromised credentials into credential-stuffing tools, use them for account takeover, and leverage corporate logins for initial access into enterprise networks — a frequent precursor to ransomware.
Defending against compromised credentials
Effective defence combines monitoring (knowing when your credentials appear in stealer logs or breaches), rapid response (forcing resets and revoking sessions), and prevention (unique passwords, password managers, phishing-resistant MFA, and watching for exposure of privileged accounts).
VantaPrism lets organisations continuously monitor for compromised credentials tied to their domains, employees, and customers as they surface in infostealer logs — enabling resets and session revocation before the credentials are exploited.
Check Your Exposure arrow_forwardFrequently Asked Questions
How do credentials become compromised?
What should I do if my credentials are compromised?
Related Terms
Infostealer malware is a category of malicious software designed to silently harvest sensitive data — passwords, sess…
A stealer log is the package of data exfiltrated from a single device by infostealer malware. It typically contains s…
Credential stuffing is an automated attack that takes username/password pairs leaked from one source and tries them e…
Account takeover (ATO) is when an attacker gains unauthorized control of a legitimate user account, typically using s…
Credential theft is the act of stealing authentication data — usernames, passwords, tokens, and session cookies — so…