Description

Deserialization of Untrusted Data vulnerability in ThemeREX Group Travesia travesia allows Object Injection.This issue affects Travesia: from n/a through 1.1.16.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-10-10T08:17:05.183Z",
  "pubdate": "2026-10-10T08:17:05.183Z",
  "executiveSummary": "The Travesia theme, developed by ThemeREX, is susceptible to a Deserialization of Untrusted Data vulnerability, categorized as an Object Injection flaw.\nThis vulnerability exists within versions ranging from n/a through 1.1.16.\nThe vulnerability allows an unauthenticated or authenticated attacker to inject malicious serialized objects into the application, which are subsequently deserialized by the PHP application.\nSuccessful exploitation of this flaw can lead to severe security implications, including Remote Code Execution (RCE), arbitrary file deletion, or sensitive data exposure, depending on the available PHP magic methods and the surrounding codebase.\nThe risk is critical as it permits attackers to manipulate application logic and gain unauthorized control over the server environment by executing arbitrary code in the context of the web server process.\nExploitation generally requires the attacker to identify an entry point that accepts serialized user input and a suitable 'gadget chain' present within the theme or the underlying WordPress environment to achieve meaningful execution.",
  "technicalDetails": "The vulnerability stems from the unsafe processing of user-supplied data through PHP's unserialize() function or similar mechanisms without sufficient validation or sanitization. In the context of the ThemeREX Travesia theme, the application fails to adequately sanitize input streams that are passed to deserialization routines.\nObject Injection occurs when an attacker provides a crafted serialized object string to the application. When the application deserializes this data, it reconstructs the object. If the application has access to classes that implement PHP magic methods—such as __destruct(), __wakeup(), or __toString()—an attacker can trigger these methods with attacker-controlled properties.\nThe attack flow typically involves the following steps: First, the attacker identifies a script or API endpoint within the Travesia theme that retrieves data from a user-controllable source, such as a GET/POST parameter, cookie, or header, and passes it to an unserialization function. Second, the attacker crafts a malicious serialized payload designed to instantiate an existing class within the application's scope. Third, the attacker leverages a 'gadget chain'—a sequence of existing code components that, when executed through magic methods, perform unintended actions. Finally, upon the triggering of these magic methods during the cleanup or instantiation phase, the injected payload executes code, modifies data, or accesses protected system resources.\nThe scope of impact is highly dependent on the 'gadgets' available within the theme's codebase and any installed plugins. If the environment contains classes that perform dangerous operations (e.g., file system interactions, database queries, or command execution) within their magic methods, the attacker can leverage these as primitives for arbitrary code execution. Because this vulnerability facilitates object injection, the attacker can effectively 'reprogram' the application's execution flow, bypassing standard security controls and authentication mechanisms. Given that Travesia is a WordPress theme, the vulnerability is exposed to any network-accessible endpoint that routes requests through the vulnerable component, requiring no elevated privileges unless the specific entry point is protected by internal access control checks."
}