A recent security vulnerability discovered in WinRAR has raised alarm bells for cybersecurity experts. A Japanese security team, CSIRT, uncovered the flaw which allows malicious actors to bypass Microsoft’s Windows Mark of the Web (MoTW) system, potentially leading to the execution of harmful programs without user knowledge. This vulnerability is designated CVE-2025-31334. To mitigate these risks to critical infrastructure, several proactive security measures are recommended. Firstly, a thorough inspection of computer network devices used by WinRAR users is crucial for identifying those affected by the vulnerability. Prompt installation of the latest version is also essential. Secondly, resetting the configuration of the WinRAR client may be necessary. Lastly, WinRAR users should avoid connecting to untrusted networks when handling sensitive data to minimize exposure.