Overview
CVE-2025-47581 is a severe vulnerability that affects the Elbisnero WordPress Events Calendar Registration & Tickets plugin. The vulnerability lies in its deserialization of untrusted data, which allows for object injection. This creates a potential for cybercriminals to compromise systems or leak data, posing a significant threat to websites using this plugin.
The security flaw is of great concern due to the popularity of WordPress and its wide use in creating websites for various purposes, ranging from personal blogs to professional business websites. It is particularly critical for websites that handle sensitive data, where a successful exploit may lead to severe consequences.
Vulnerability Summary
CVE ID: CVE-2025-47581
Severity: Critical (9.8 CVSS score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System Compromise and Data Leakage
Affected Products
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Product | Affected Versions
Elbisnero WordPress Events Calendar Registration & Tickets | up to 2.6.0
How the Exploit Works
The vulnerability is rooted in the plugin’s deserialization of untrusted data. Deserialization is the process of converting a stream of bytes back into a copy of the original object. However, if an attacker can manipulate the serialized data (the byte stream), they can control the structure of the deserialized object. This control may allow them to execute arbitrary code, alter data, or perform other malicious activities.
Conceptual Example Code
The following pseudocode demonstrates a conceptual example of how an attacker might exploit this vulnerability:
POST /wp-content/plugins/elbisnero-events-calendar/endpoint HTTP/1.1
Host: vulnerable-website.com
Content-Type: application/php-serialized-object
O:8:"Attacker":2:{s:4:"code";s:39:"system('rm -rf /'); // Arbitrary code execution";s:5:"value";s:5:"dummy";}In this example, the attacker sends a serialized PHP object that, when deserialized by the vulnerable plugin, executes the system command ‘rm -rf /’ leading to destructive consequences.
Mitigation Guidance
Users are strongly advised to apply the vendor patch as soon as it’s available. Until then, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation method, ensuring that serialized objects are not accepted from untrusted sources. Regularly updating your software and employing good cybersecurity practices can also significantly reduce the risk.