Mirc 7.55 - Seupirate -

In versions prior to 7.55, attackers could use malicious irc:// links to pass command-line arguments to mIRC.

Supports a powerful proprietary scripting language for automation mIRC 7.55 - SeuPirate

The most vital aspect of version 7.55 was the fix for a vulnerability. In versions prior to 7

For users still on older versions, upgrading is strongly recommended via the official mIRC download page to protect against the URI protocol vulnerability. Latest News - mIRC Latest News - mIRC Beyond security, this version

Beyond security, this version included several functional updates to improve the user experience on newer operating systems like Windows 10 and 11:

Changed the editbox in the Script Editor and status windows to use the msftedit.dll richedit control for better Unicode handling.

This allowed them to force the application to load a remote configuration file ( mirc.ini ) from an attacker-controlled server, potentially executing arbitrary code on the user's machine.