Description

Deserialization of Untrusted Data vulnerability in ThemeREX Group Smart Casa smart-casa allows Object Injection.This issue affects Smart Casa: from n/a through 1.0.12.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-10-10T08:17:05.547Z",
  "pubdate": "2026-10-10T08:17:05.547Z",
  "executiveSummary": "The Smart Casa WordPress theme, developed by ThemeREX Group, is susceptible to a Deserialization of Untrusted Data vulnerability, specifically categorized as PHP Object Injection.\nThis vulnerability exists in versions 1.0.12 and earlier, posing a critical security risk to WordPress environments.\nThe vulnerability occurs because the application fails to adequately sanitize or validate user-supplied serialized data before passing it to native PHP deserialization functions.\nAn unauthenticated or remote attacker can supply a crafted, malicious serialized string to the vulnerable endpoint. Upon processing, this input can instantiate arbitrary PHP objects within the application scope.\nThe potential impact is severe, potentially leading to Remote Code Execution (RCE), arbitrary file deletion, or sensitive data exfiltration, depending on the availability of 'gadget chains' present within the WordPress core, theme, or installed plugins.\nThe exploitation does not necessarily require administrative privileges, and the risk level is high due to the potential for full site compromise.\nUsers are advised to investigate alternative configurations or restrict access to vulnerable endpoints until a vendor-supplied security update is confirmed and applied.",
  "technicalDetails": "The vulnerability stems from the improper handling of user-controllable input that is subsequently passed to the PHP 'unserialize()' function without appropriate verification or integrity checking.\nIn the context of the Smart Casa theme, this defect allows an attacker to inject arbitrary serialized objects into the application's memory space. When the PHP interpreter deserializes this malicious payload, it triggers the instantiation of classes defined within the application environment.\nThe exploitation mechanism relies on 'Property Oriented Programming' (POP), where an attacker identifies and leverages existing 'gadget chains'—a sequence of class methods (specifically magic methods like __wakeup(), __destruct(), or __toString())—to execute unintended code paths.\nThe attack flow typically follows these steps: 1. Identification of an input parameter that is processed by 'unserialize()'. 2. Crafting a malicious serialized payload containing the desired object structure and manipulated properties. 3. Transmission of the payload via HTTP GET or POST requests to the vulnerable component. 4. Application-side execution of the 'unserialize()' function, which reconstructs the malicious object. 5. Triggering of magic methods during the object lifecycle, resulting in the execution of the unintended logic chain.\nBecause the WordPress ecosystem frequently utilizes a vast array of plugins and themes, the gadget pool available for an attacker is often extensive, significantly increasing the probability that an attacker can chain together sufficient code blocks to achieve Remote Code Execution.\nThe vulnerability impacts Smart Casa versions from n/a through 1.0.12. It represents a common yet critical flaw in PHP-based web applications where data handling logic trusts external input implicitly.\nPost-exploitation impact is extensive; once a gadget chain is successfully triggered, the attacker may bypass security restrictions, execute system-level commands, or manipulate the database, effectively compromising the integrity, availability, and confidentiality of the WordPress installation."
}