Overview
The Common Vulnerabilities and Exposures (CVE) system has recently identified a critical vulnerability, CVE-2025-39480, that affects ThemeMakers Car Dealer, a popular software used in the automotive industry. This vulnerability is of particular concern due to its high Common Vulnerability Scoring System (CVSS) severity score of 9.8, indicating a high risk of potential system compromise or data leakage.
The vulnerability lies within the deserialization of untrusted data, which could allow for harmful object injection. This issue is prevalent in versions up to and including 1.6.6 of the Car Dealer software. Given the widespread use of this software, the potential for damage is significant, making it vital for users to understand and mitigate this vulnerability.
Vulnerability Summary
CVE ID: CVE-2025-39480
Severity: Critical (CVSS: 9.8)
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
ThemeMakers Car Dealer | up to and including 1.6.6
How the Exploit Works
The vulnerability stems from the application’s insecure deserialization process. When untrusted data is deserialized, it can lead to object injection – this means that an attacker could manipulate serialized (or stored) data to create new objects within the application, or alter existing ones. This could potentially allow the attacker to execute arbitrary code, ultimately leading to system compromise or data leakage.
Conceptual Example Code
An example of how the vulnerability might be exploited could look like this:
POST /thmkr/vulnerable/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"object": {
"__type":"java.lang.Runtime",
"val":"getRuntime().exec('malicious_code')"
}
}This code sends a POST request to a vulnerable endpoint within the ThemeMakers Car Dealer application. It contains a JSON object that, when deserialized, triggers the application to execute the ‘malicious_code.
Mitigation
Users of the affected ThemeMakers Car Dealer versions are urged to apply the vendor patch as soon as it is available. In the meantime, or if a patch is not possible, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as temporary mitigation. These systems can be configured to detect and block attacks exploiting this vulnerability, which can provide a layer of protection until a more permanent solution can be implemented.