CVE-2025-12673
Summary
CVE-2025-12673 is a critical vulnerability affecting the Flex QR Code Generator plugin for WordPress. This vulnerability allows unauthenticated attackers to upload arbitrary files to the affected server due to missing file type validation, potentially leading to remote code execution.
Technical Details
The vulnerability resides in the update_qr_code() function within the Flex QR Code Generator plugin. Specifically, the function lacks proper validation of the file type being uploaded. An attacker can exploit this by crafting a malicious request that uploads a file with a dangerous extension (e.g., .php, .exe) to the server. Because there are no checks to ensure the file is a legitimate image or other expected file type, the server accepts and stores the file. This uploaded file can then be accessed and executed, potentially granting the attacker full control of the server.
The lack of authentication required to trigger this vulnerability significantly increases the risk, as any visitor to the website can potentially exploit it. The impact is further amplified by the potential for remote code execution, allowing attackers to install malware, steal sensitive data, or deface the website.
Affected Products and Versions
- Flex QR Code Generator WordPress Plugin versions up to and including 1.2.6
Impact Assessment
Successful exploitation of CVE-2025-12673 can have severe consequences.
- Remote Code Execution: Attackers can execute arbitrary code on the server, potentially gaining complete control.
- Data Breach: Sensitive data stored on the server, including user credentials and database information, could be compromised.
- Website Defacement: Attackers can modify the website's content, damaging its reputation and potentially spreading malware.
- Denial of Service: Attackers can overload the server with requests, making the website unavailable to legitimate users.
Remediation
Immediate Actions
- Update the Plugin: Upgrade the Flex QR Code Generator plugin to the latest version. The vulnerability has been patched in versions greater than 1.2.6.
- Monitor Website Activity: Closely monitor your website's logs for any suspicious activity, such as unusual file uploads or attempts to access unexpected files.
- Implement Web Application Firewall (WAF): Deploy a WAF with rules to block arbitrary file upload attempts.
Long-term Solutions
- Implement File Type Validation: Ensure that all file upload functionalities include robust file type validation to prevent the upload of malicious files.
- Regular Security Audits: Conduct regular security audits of your WordPress website and plugins to identify and address potential vulnerabilities.
References
Detection & Scanning
This vulnerability can be detected by analyzing network traffic for suspicious file upload requests, particularly those with unusual file extensions. Security scanners, such as those offered by Secably, can automatically detect vulnerable versions of the Flex QR Code Generator plugin.
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