CVE-2026-125449 in Testimonial Slider Plugin
Summary
by MITRE • 11/15/2026
Deserialization of Untrusted Data vulnerability in Mamunur Rashid Testimonial Slider testimonial-slider-and-showcase allows Object Injection.This issue affects Testimonial Slider: from n/a through 3.0.2.
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Analysis
by VulDB Data Team • 11/15/2026
The identified vulnerability represents a critical security flaw within the Mamunur Rashid Testimonial Slider plugin, specifically affecting versions ranging from an unspecified initial release up to version 3.0.2. This issue is categorized as a Deserialization of Untrusted Data vulnerability, which fundamentally allows for Object Injection attacks against systems running the affected software. In web application architecture, deserialization refers to the process of converting data structures or objects stored in formats such as JSON, XML, or serialized PHP arrays back into executable code within memory. When this process is applied to untrusted input without adequate validation or sanitization, it creates a severe attack vector that can be exploited by malicious actors to compromise system integrity and confidentiality.
The technical root cause lies in the plugin's handling of user-supplied data during the deserialization phase. Instead of strictly validating the type, structure, and origin of incoming data before processing it into an object, the application accepts arbitrary input from external sources. This lack of rigorous input validation permits attackers to craft malicious serialized payloads that contain harmful objects or code execution instructions. When the vulnerable function processes this untrusted data, it instantiates these objects within the server's memory space. Because PHP and many other web technologies allow for magic methods such as __wakeup() or __destruct(), an attacker can leverage these hooks to trigger arbitrary functions or execute system commands remotely, effectively achieving Remote Code Execution (RCE) under certain configurations.
From a classification perspective, this vulnerability aligns with CWE-502, which denotes Deserialization of Untrusted Data. This weakness is particularly dangerous because it bypasses traditional input filtering mechanisms that focus on string manipulation rather than object state reconstruction. Furthermore, in the context of the MITRE ATT&CK framework, this flaw facilitates techniques associated with Execution and Persistence, specifically under T1059 Command and Scripting Interpreter or potentially T1190 Exploit Public-Facing Application if exploited via a web interface. The ability to inject objects means that an attacker is not limited to simple data leakage; they can manipulate the application's internal state, escalate privileges by interacting with administrative functions, or pivot further into the network infrastructure hosting the vulnerable WordPress instance.
The operational impact of this vulnerability is severe and multifaceted. Successful exploitation allows a remote unauthenticated attacker to execute arbitrary code on the web server where the plugin is installed. This can lead to complete compromise of the underlying operating system, depending on the permissions under which the web server process runs. Attackers may use this access to deface websites, install backdoors for persistent access, exfiltrate sensitive database contents including user credentials and personal data, or utilize the compromised host as a pivot point for attacking other internal systems. Given that WordPress plugins are often widely deployed across thousands of sites, this vulnerability poses a significant risk to a large segment of the web ecosystem if left unpatched.
Mitigation strategies must prioritize immediate remediation through software updates. Administrators running versions 3.0.2 and below should upgrade immediately to the latest patched version released by Mamunur Rashid, which presumably addresses the input validation logic in the deserialization routine. In cases where an update is not immediately feasible or available for older legacy installations, temporary mitigations include disabling file uploads if they are involved in the attack vector, implementing strict Content Security Policy headers to limit script execution, and deploying a Web Application Firewall configured with rules that detect anomalous serialized data patterns or known exploit signatures associated with PHP object injection. Additionally, enforcing principle of least privilege for web server processes can help contain the blast radius should an exploitation attempt succeed by limiting the system-level actions the compromised application process is permitted to perform.