If You Reuse Passwords, the LeakBase Vulcan 1.6M ULP Leak Should Worry You

If you use the same password on more than one website, a stealer log called Vulcan 1.6M ULP posted to the LeakBase forum in November 2024 is a direct threat to your accounts. The dataset contains approximately 1.6 million total records, of which 239,230 are unique email and plaintext password combinations. Because the passwords were captured live from infected devices, not cracked from hashed storage, they were valid at the moment of theft. Password reuse turns a single infected machine into access for every account that shared that credential.

Why This Is Dangerous

Stealer logs like Vulcan are built by malware running silently on victim machines. The malware reads browser-saved passwords and active sessions, then packages and uploads the data. There is no server-side vulnerability to patch. The attack already happened on the endpoint. The resulting log is then distributed on underground forums like LeakBase, where it becomes available to any buyer or downloader within hours of posting.

What Was Exposed

• Email Address — 239,230 unique addresses confirmed
• Plaintext Password — captured directly from browser saved-password stores and active sessions
• HomePage URL — identifies which specific login page was active at time of capture

Why This Matters

The combination of a plaintext password and its associated login URL removes nearly all friction for an attacker:

• Credential stuffing — automated tools test the exact same email and password against banking, retail, and social media platforms
• Account takeover — once inside, attackers change recovery details to lock out the real owner
• Identity theft — email account access enables full identity recovery attacks across linked services
• Fraud — financial accounts, loyalty points, and stored payment methods are immediately monetized

How Stealer Log Breaches Work

Infostealer malware such as RedLine, Raccoon, and Vidar is sold as a service on underground markets. Cybercriminals deploy it via phishing attachments, fake software downloads, and malicious ads. Once running on a victim's device, it harvests all saved browser credentials and cookies, then transmits them back to the attacker's server. The resulting ULP (URL:Login:Password) file is then packaged and sold or shared. The Vulcan 1.6M ULP log on LeakBase is one instance of this factory-scale credential theft operation.

Check If You Are Affected

Heroic's breach database indexes over 400 billion records, including stealer log collections. Enter your email address to find out whether your credentials appear in known leaks.

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Related LeakBase ULP Dumps

Vulcan 1.6M ULP is one of many credential packages distributed through the LeakBase forum. Other documented dumps include:

• LeakBase 40M Ulp by wheatball
• LeakBase 18Kk Ulp by farmagol