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.
mIRC version 7.55 is a major release of the popular Internet Relay Chat (IRC) client, primarily noted for addressing critical security vulnerabilities and improving modern Windows compatibility. mIRC 7.55 - SeuPirate
In versions prior to 7.55, attackers could use malicious irc:// links to pass command-line arguments to mIRC. This allowed them to force the application to
Beyond security, this version included several functional updates to improve the user experience on newer operating systems like Windows 10 and 11: mIRC 7.55 - SeuPirate
The most vital aspect of version 7.55 was the fix for a vulnerability.
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
Updated the OpenSSL library (to v1.1.1b at the time of release) and the CA root certificates to ensure secure connections.