The Vuln_Plesk Leak Happened Weeks Ago. It’s Still Circulating.

HEROIC analysts flagged a combolist called Vuln_Plesk uploaded to a Telegram channel on 29-Jun-2026. The file is small, just 431 records, but every entry pairs an email or username with a plaintext password and a linked URL, and the name suggests the credentials are connected to Plesk server control panels. Why This Is Dangerous: Plesk is server management software used to run websites and hosting accounts, so credentials tied to it can give an attacker far more access than a typical email login, potentially reaching an entire website or server rather than just one inbox. What Was Exposed: - Email addresses or usernames - Plaintext passwords - URLs linked to each login Why This Matters: Even a small file like this one carries outsized risk when the accounts involved control web infrastructure. An attacker who gets into a Plesk panel could deface websites, steal customer data, or use the server to launch further attacks, all from a leak of just a few hundred records. How a Combolist Like This Works: Combolists such as this are often built by scanning for known software vulnerabilities, in this case in Plesk installations, then harvesting whatever login credentials are exposed as a result. The data is packaged into a simple text file and shared on Telegram for other criminals to exploit. Check If You Are Affected: If you manage a website or server, especially one running Plesk, check your credentials against HEROIC's free breach scanner, which searches more than 400 billion leaked records, to help you catch exposure before it is used against you.