ArtHouse Cloud: 12,866 Passwords Leaked on Telegram

In August 2025, a Telegram user posted a stealer log file containing 12,866 records connected to ArtHouse Cloud. The upload happened on August 12th and went largely unnoticed by the public. But smaller dumps are not less serious. Each of those 12,866 records represents a real person with a real email address and a real password sitting in plaintext. The attackers who picked up this file did not need anything else. The credentials were ready to use the moment the file landed.

Why This Is Dangerous

The ArtHouse Cloud stealer log from August 12, 2025 is a focused dump of credential data with no barriers to exploitation. Plaintext passwords mean no cracking required. Email addresses provide the username. URLs in the log file identify the target services. That combination gives attackers everything they need to start taking over accounts immediately. Credential stuffing tools can process 12,866 pairs across dozens of platforms in a matter of hours. The relatively small size of this dump does not reduce its danger. It means the credentials are more likely to be from a specific, targeted group of users, which can actually make the attacks more precise.

What Was Exposed

• Email addresses from ArtHouse Cloud user accounts
• Plaintext passwords stolen directly from infected devices by stealer malware
• URLs and API endpoints identifying the services those accounts were accessing
• 12,866 total records leaked on August 12, 2025
• Shared openly on a public Telegam channel with no restrictions

Why This Matters

A breach of 12,866 records is easy to underestimate, but the consequences for affected individuals are the same as in any larger dump. Working plaintext passwords combined with email addresses mean that every account on every platform where that combination was used is now at risk. Stealer malware also captures session cookies, which means some accounts may have been accessed before the log was even published publicly. The August 12th date means this data has been circulating for months. People who have not changed their passwords or reviewed their account activity since then are still exposed right now, and they likely have no idea.

How Stealer Log Works

Stealer malware infiltrates devices through phishing emails, pirated software, or maliciuos websites. Once installed, it runs quietly in the background and methodically extracts credentials stored in web browsers, password managers integrated with browsers, autofill forms, and active session cookies. It also captures data from applications that store login information locally. The collected data is packaged into a log file and sent to the attacker's server, often before the user closes their laptop. Victims typically have no idea the malware was ever running. The log files are then aggregated and posted to Telegram or sold on dark web markets, where they get picked up by other criminal operators and used for account takeover campaigns.

Check If You Are Affected

HEROIC Guardian has indexed over 400 billion exposed records, including this ArtHouse Cloud stealer log from August 12, 2025. A quick search on your email address will tell you whether your credentials appear in this dump or any other known breach in the database.

Search your email on HEROIC Guardian now and find out in seconds. It is free and does not require creating an account.