What? 
Meta has issued an urgent warning to Windows users of WhatsApp, advising them to update the app to the latest version to fix a security vulnerability that could allow attackers to execute malicious code on their devices. This flaw, known as CVE-2025-30401, involves a spoofing issue where malicious files can be disguised to trick users into executing harmful code. Meta has resolved the issue with the release of WhatsApp version 2.2450.6.4 
The vulnerability stemmed from WhatsApp displaying attachments based on their MIME type - a standard that indicates the nature and format of a file - while using the file's extension to determine how it should be opened. This could lead users to inadvertently run malicious code when opening attachments. Meta has not confirmed whether this flaw was exploited in real-world attacks but stresses the importance of updating to the latest version to ensure security.5 
So what? 
WhatsApp has been a frequent target for sophisticated attacks, including spyware. In recent incidents, vulnerabilities have been exploited to install spyware without user interaction, highlighting the app's exposure to advanced threats. This vulnerability underscores the importance of maintaining up-to-date software to safeguard against potential exploits.6 
Beyond the immediate need to update WhatsApp, this incident serves as a reminder of the broader cybersecurity landscape. Users should be aware of the tactics employed by cybercriminals, who often leverage seemingly innocuous files to gain access to systems. Regular updates and vigilance are essential in protecting personal and sensitive information.7 
For organisations, this situation highlights the necessity of implementing robust security protocols and ensuring that employees are educated about potential threats.8 Encouraging regular software updates and fostering a culture of cybersecurity awareness can significantly reduce the risk of exposure to such vulnerabilities.