One of the most popular WinRAR archivers is actively downloaded and used by tens of millions of users around the world. However, like most programs with multiple users, WinRAR has become an object of interest to hackers trying to use the program to infiltrate victims’ computers. Experts at Check Point Research, a computer security research company, have discovered a vulnerability in WinRAR. During the analysis, a part of the program code was found that has the ability to move the infected file from the archive of the ACE format directly to the startup folder of the Windows OS, bypassing the need to run the application with elevated privileges. The vulnerability was discovered in the UNACEV2.dll library, which has not been updated since 2005. According to researchers, this defect could put over 500 million users at risk for many years. Check Point says WinRAR decided last month to stop supporting the ACE archive format, which opens the door for attackers. At the same time, the UNACEV2.dll file was deleted from the software. Thus, the problem for users of WinRAR version: 5.70 beta 1 has already been fixed, we recommend updating the program by downloading it from the official site.