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A critical spoofing vulnerability, identified as CVE-2025-30401, has been discovered in WhatsApp for Windows. Meta, the parent company of WhatsApp, has released a security update to address this flaw, which impacts versions prior to 2.2450.6. The vulnerability could allow attackers to trick users and enable remote code execution on their devices. Users of WhatsApp for Windows are strongly advised to update to the latest version immediately to mitigate the risk. This issue arises from a discrepancy in how WhatsApp handles file attachments, specifically the mismatch between the MIME type and file extension handling.
The exploit mechanism involves attackers sending maliciously crafted files with altered file types to potential targets. The WhatsApp application displays attachments based on their MIME type but selects the file opening handler based on the attachment's filename extension. This allows an attacker to craft a malicious file that appears harmless, such as an image, but when opened, executes arbitrary code. The spoofing technique takes advantage of the discrepancy between MIME type and file extension handling, allowing attackers to execute arbitrary code on the victim’s system.
The discovery of CVE-2025-30401 has raised concerns within the cybersecurity community, highlighting the importance of maintaining robust security practices in widely-used applications. While Meta has not reported any exploitation of this vulnerability in the wild, vulnerabilities in messaging applications like WhatsApp are frequently targeted by malicious actors. The impact of a successful exploit could include unauthorized system access and data theft, posing significant risks to users. To ensure protection, users should promptly update their WhatsApp for Windows application to version 2.2450.6 or later.
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The exploit mechanism involves attackers sending maliciously crafted files with altered file types to potential targets. The WhatsApp application displays attachments based on their MIME type but selects the file opening handler based on the attachment's filename extension. This allows an attacker to craft a malicious file that appears harmless, such as an image, but when opened, executes arbitrary code. The spoofing technique takes advantage of the discrepancy between MIME type and file extension handling, allowing attackers to execute arbitrary code on the victim’s system.
The discovery of CVE-2025-30401 has raised concerns within the cybersecurity community, highlighting the importance of maintaining robust security practices in widely-used applications. While Meta has not reported any exploitation of this vulnerability in the wild, vulnerabilities in messaging applications like WhatsApp are frequently targeted by malicious actors. The impact of a successful exploit could include unauthorized system access and data theft, posing significant risks to users. To ensure protection, users should promptly update their WhatsApp for Windows application to version 2.2450.6 or later.
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References :
- securityaffairs.com: WhatsApp fixed a spoofing flaw that could enable Remote Code Execution
- Talkback Resources: WhatsApp Vulnerability Could Facilitate Remote Code Execution [app] [exp]
- The DefendOps Diaries: Understanding the WhatsApp for Windows Vulnerability: CVE-2025-30401
- BleepingComputer: Meta warned Windows users to update the WhatsApp messaging app to the latest version to patch a vulnerability that can let attackers execute malicious code on their devices.
- hackread.com: WhatsApp for Windows Flaw Could Let Hackers Sneak In Malicious Files
- infosec.exchange: vulnerability CVE-2025-30401 impacting all WhatsApp versions can let attackers execute malicious code on your devices. The flaw can be exploited by attackers by sending maliciously crafted files with altered file types to potential targets:
- PCMag UK security: WhatsApp Patches Bug That Can Execute Malware on Windows PCs
- darkwebinformer.com: DarkWebInformer Article on CVE-2025-30401: WhatsApp for Windows Spoofing Prior to Version 2.2450.6
- cyberinsider.com: WhatsApp for Windows Vulnerable to Spoofing Flaw Leading to Code Execution
- securityonline.info: SecurityOnline news detail for WhatsApp for Windows Spoofing Vulnerability: Execute Code Risk (CVE-2025-30401)
- The Register - Security: What a MIME field A bug in WhatsApp for Windows can be exploited to execute malicious code by anyone crafty enough to persuade a user to open a rigged attachment - and, to be fair, it doesn't take much craft to pull that off.
- bsky.app: Meta warned Windows users to update the WhatsApp messaging app to the latest version to patch a vulnerability that can let attackers execute malicious code on their devices.
- ComputerWeekly.com: Spoofing vuln threatens security of WhatsApp Windows users
- www.csoonline.com: CSOOnline article on Whatsapp plugs bug allowing RCE with spoofed filenames
- Help Net Security: WhatsApp vulnerability could be used to infect Windows users with malware (CVE-2025-30401)
- Malwarebytes: WhatsApp for Windows vulnerable to attacks. Update now!
- www.bleepingcomputer.com: WhatsApp flaw can let attackers run malicious code on Windows PCs
- www.scworld.com: Malicious code execution possible with patched WhatsApp flaw
Classification:
- HashTags: #WhatsApp #RCE #SecurityUpdate
- Company: Microsoft
- Target: WhatsApp for Windows users
- Product: WhatsApp
- Feature: spoofing
- Type: Vulnerability
- Severity: Critical