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A security advisory from Facebook details a spoofing vulnerability in WhatsApp for Windows, highlighting a potential risk where malicious actors could trick users into executing arbitrary code. The vulnerability, tracked as CVE-2025-30401, stems from how the application handles file attachments.
The advisory explains that “a spoofing issue in WhatsApp for Windows prior to version 2.2450.6 displayed attachments according to their MIME type but selected the file opening handler based on the attachment’s filename extension.” This discrepancy could be exploited by a malicious attacker.
Here’s how the attack could work: A cybercriminal could craft a file that has a misleading combination of MIME type and filename extension. For example, a file might be displayed as an image (MIME type) within WhatsApp, but have an executable extension (.exe). If a user were to manually open this attachment from within WhatsApp, the system would use the file extension to determine how to open the file, potentially leading to the execution of malicious code instead of simply viewing an image.
The affected versions of WhatsApp for Windows are:
- affected: from 0.0.0 before 2.2450.6
The advisory indicates that the default status is “unaffected,” but clarifies that versions from 0.0.0 up to, but not including, 2.2450.6 are vulnerable.
The primary mitigation for this vulnerability is to update WhatsApp for Windows to version 2.2450.6 or later. This update addresses the spoofing issue and ensures that attachments are handled securely.
This type of spoofing vulnerability can be particularly dangerous because it relies on user trust. Users generally trust that applications will handle files in a safe and predictable manner. By exploiting this trust, attackers can potentially bypass security measures and gain unauthorized access to systems.
Users of WhatsApp for Windows are strongly encouraged to update their applications immediately to protect themselves from this vulnerability.
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