CVE-2025-53299 in Visual Content Composer Plugin
Summary
by MITRE • 08/20/2025
Deserialization of Untrusted Data vulnerability in ThemeMakers ThemeMakers Visual Content Composer allows Object Injection. This issue affects ThemeMakers Visual Content Composer: from n/a through 1.5.8.
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Analysis
by VulDB Data Team • 08/20/2025
The CVE-2025-53299 vulnerability represents a critical deserialization flaw within the ThemeMakers Visual Content Composer plugin, specifically targeting versions ranging from the initial release through 1.5.8. This vulnerability falls under the broader category of insecure deserialization issues that have been systematically catalogued under CWE-502, which describes the deserialization of untrusted data as a fundamental security weakness. The flaw manifests when the plugin processes user-supplied data that undergoes deserialization without proper validation or sanitization, creating an avenue for malicious actors to inject arbitrary objects into the application's memory space.
The technical implementation of this vulnerability enables attackers to exploit the plugin's handling of serialized data structures, particularly within the visual content composition functionality. When the plugin receives serialized input through various user interaction points, it fails to validate or sanitize the incoming data before deserializing it into executable objects. This allows threat actors to craft malicious serialized payloads that, when processed, can trigger unintended object injection behaviors. The vulnerability's impact extends beyond simple data manipulation as it can potentially enable remote code execution or privilege escalation depending on the target environment's configuration and the application's execution context.
From an operational perspective, this vulnerability presents significant risk to WordPress installations utilizing the affected ThemeMakers Visual Content Composer plugin. The attack surface is particularly concerning as it operates within the context of content management systems where users often have the ability to submit data through various interface elements. The vulnerability's exploitation requires minimal prerequisites, making it attractive to automated attack tools that scan for known patterns of insecure deserialization. The potential for object injection allows attackers to manipulate the application's behavior in ways that could lead to complete system compromise, data exfiltration, or the establishment of persistent backdoors within the affected environment.
Security practitioners should consider this vulnerability in the context of the MITRE ATT&CK framework, particularly under the techniques related to deserialization attacks and privilege escalation. The vulnerability's classification as a deserialization flaw aligns with ATT&CK technique T1210 which covers exploitation of remote services through deserialization. Organizations should implement immediate mitigations including updating to the latest plugin version where the vulnerability has been patched, implementing network segmentation to limit access to vulnerable systems, and deploying web application firewalls to detect and block suspicious deserialization patterns. Additionally, the implementation of input validation and output encoding mechanisms can provide defense-in-depth protection against similar vulnerabilities that may not yet have patches available.
The remediation approach for CVE-2025-53299 requires immediate attention from system administrators and security teams responsible for WordPress installations. The most effective mitigation strategy involves upgrading the ThemeMakers Visual Content Composer plugin to version 1.5.9 or later where the deserialization vulnerability has been addressed through proper input validation and sanitization measures. Security configurations should also include disabling unnecessary user capabilities that might allow data submission to areas where deserialization occurs, implementing strict access controls, and conducting thorough code reviews to identify other potential deserialization points within the application stack. Regular security assessments and vulnerability scanning should be implemented to proactively identify similar issues that may exist within the broader application ecosystem.