CVE-2026-93933 in Rosalinda Plugin
Summary
by MITRE • 10/10/2026
Deserialization of Untrusted Data vulnerability in ThemeREX Group Rosalinda rosalinda allows Object Injection.This issue affects Rosalinda: from n/a through 1.2.4.
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Analysis
by VulDB Data Team • 10/10/2026
The identified vulnerability represents a critical security flaw within the Rosalinda theme developed by ThemeREX Group, specifically affecting versions ranging from initial releases up to version 1.2.4. This issue is classified as an Object Injection vulnerability resulting from the deserialization of untrusted data. In web application architecture, themes often handle user input or external data sources that are processed through PHP functions capable of reconstructing serialized objects. When these systems fail to properly validate or sanitize the incoming data before passing it to a deserialization function such as unserialize(), they create an attack vector where malicious actors can inject crafted object payloads into the application context.
From a technical perspective, this flaw stems from insufficient input validation mechanisms during the processing of user-supplied content. The vulnerability allows attackers to manipulate the internal state of PHP objects by injecting serialized data that contains arbitrary class instantiations and method calls. This is particularly dangerous in environments where certain classes have magic methods like __wakeup(), __destruct(), or __toString() that execute code automatically upon deserialization. By exploiting this, an attacker can achieve remote code execution, privilege escalation, or denial of service conditions depending on the available gadget chains within the application and its dependencies. The lack of strict type checking and whitelist-based validation for serialized data is a common root cause in such scenarios, reflecting a failure to enforce secure coding practices regarding dynamic object instantiation.
The operational impact of this vulnerability is severe due to its potential for full system compromise. An attacker who successfully exploits this flaw can execute arbitrary commands on the server hosting the WordPress instance running Rosalinda. This could lead to unauthorized access to sensitive data, modification or deletion of website content, installation of webshells for persistent backdoor access, and further lateral movement within the network infrastructure. Since themes are often widely deployed across numerous websites, this vulnerability poses a significant risk to the broader ecosystem if left unpatched. The ability to inject objects means that even users with limited privileges might be able to escalate their rights or disrupt service availability by causing fatal errors through malformed object structures.
This vulnerability aligns closely with CWE-502, which describes Deserialization of Untrusted Data, and is also associated with CWE-913 for Improper Control of Dynamically-Managed Resources Identification if the injection leads to resource exhaustion. In terms of offensive security frameworks, this exploit technique corresponds to ATT&CK tactic T1190, Exploit Public-Facing Application, specifically leveraging techniques related to remote code execution via deserialization flaws such as those documented under T1059 Command and Scripting Interpreter when gadget chains are utilized for command execution.
To mitigate this risk, immediate action is required by updating the Rosalinda theme to a version newer than 1.2.4 where the issue has been resolved through improved input validation and safer handling of serialized data. Administrators should ensure that all dependencies within their WordPress environment are also up to date, as third-party plugins may introduce additional deserialization risks if they rely on similar patterns. Implementing strict allowlists for permitted classes during deserialization processes is a recommended long-term defense strategy. Additionally, deploying Web Application Firewalls with rules capable of detecting anomalous serialized data payloads can provide an extra layer of protection against exploitation attempts while patching efforts are underway. Regular security audits and code reviews focusing on input handling mechanisms will help prevent similar vulnerabilities in future development cycles.