CVE-2026-57744 in RT-Theme 18 Plugin
Summary
by MITRE • 07/13/2026
Deserialization of Untrusted Data vulnerability in stmcan RT-Theme 18 | Extensions rt18-extensions allows Object Injection.This issue affects RT-Theme 18 | Extensions: from n/a through <= 2.5.
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Analysis
by VulDB Data Team • 07/13/2026
This deserialization vulnerability in the stmcan RT-Theme 18 | Extensions rt18-extensions component represents a critical security weakness that enables remote code execution through object injection attacks. The flaw occurs when the application processes untrusted data during the deserialization phase, allowing attackers to inject malicious objects that can be executed within the application context. This vulnerability falls under CWE-502 which specifically addresses deserialization of untrusted data, making it particularly dangerous as it directly enables arbitrary code execution capabilities.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization mechanisms within the theme extension framework. When the system receives serialized data from external sources without proper verification, it automatically deserializes the objects without ensuring their integrity or origin. Attackers can craft malicious serialized objects that contain executable payloads which will be processed by the vulnerable application, effectively bypassing normal security controls. This type of vulnerability is particularly concerning in web applications where user inputs are frequently processed and can originate from various untrusted sources.
The operational impact of this vulnerability extends beyond simple data compromise to include full system takeover capabilities. An attacker who successfully exploits this weakness can execute arbitrary code on the affected server, potentially leading to complete system compromise, data exfiltration, and persistence mechanisms. The vulnerability affects versions up to and including 2.5, indicating a widespread exposure across multiple releases of the theme extension. This type of attack vector aligns with ATT&CK technique T1059.007 which covers scripting languages for execution, as attackers can leverage this vulnerability to execute malicious code through serialized object injection.
Mitigation strategies should focus on implementing strict input validation and sanitization procedures that prevent deserialization of untrusted data. Organizations must ensure that all user-supplied data undergoes rigorous verification before any processing occurs, particularly when dealing with serialized objects. The recommended approach includes implementing proper object whitelisting mechanisms, using safe serialization formats, and employing additional layers of security such as application firewalls and runtime monitoring systems. Security patches should be applied immediately to update the affected versions to prevent exploitation attempts. Organizations should also consider implementing network segmentation and access controls to limit the potential impact of successful attacks, while maintaining comprehensive logging and monitoring capabilities to detect suspicious deserialization activities.