CVE-2025-68047: Eventin wp-event-solution Object Injection

CVE-2025-68047 Overview

CVE-2025-68047 is a Deserialization of Untrusted Data vulnerability affecting the Arraytics Eventin (wp-event-solution) WordPress plugin. This vulnerability allows attackers to perform PHP Object Injection attacks, potentially leading to remote code execution, privilege escalation, or other severe security impacts depending on the gadget chains available within the WordPress installation.

The vulnerability stems from improper handling of serialized data within the plugin, where untrusted user input is deserialized without adequate validation. When exploited, attackers can inject arbitrary PHP objects that may trigger dangerous functionality through magic methods during the deserialization process.

Critical Impact

PHP Object Injection vulnerabilities can lead to remote code execution, arbitrary file operations, or complete WordPress site compromise when combined with suitable gadget chains present in the target environment.

Affected Products

• Arraytics Eventin (wp-event-solution) versions up to and including 4.1.1
• WordPress installations running vulnerable Eventin plugin versions

Discovery Timeline

• 2026-01-22 - CVE CVE-2025-68047 published to NVD
• 2026-01-22 - Last updated in NVD database

Technical Details for CVE-2025-68047

Vulnerability Analysis

This vulnerability is classified under CWE-502 (Deserialization of Untrusted Data). PHP Object Injection occurs when an application deserializes user-controllable data using functions like unserialize() without proper validation. The Eventin plugin fails to adequately sanitize or validate serialized input before processing it, allowing attackers to craft malicious serialized payloads.

The impact of this vulnerability depends heavily on the "gadget chains" available in the WordPress environment. A gadget chain is a sequence of existing classes that, when their magic methods (such as __wakeup(), __destruct(), or __toString()) are triggered during deserialization, can be chained together to perform malicious operations. Common exploitation outcomes include arbitrary file read/write, remote code execution, SQL injection, and denial of service.

Root Cause

The root cause lies in the insecure use of PHP's unserialize() function on user-controlled input within the Eventin plugin. The plugin does not implement proper input validation, allowlisting of expected classes, or use of safe serialization alternatives like json_encode()/json_decode(). This oversight allows attackers to pass crafted serialized strings containing malicious object references.

Attack Vector

The attack vector for this vulnerability involves submitting specially crafted serialized PHP objects through plugin functionality that processes user input. When the vulnerable code path deserializes this malicious input, the attacker's injected objects are instantiated, potentially triggering dangerous magic method chains.

Attackers typically identify the vulnerable input point, analyze available classes in the WordPress installation for exploitable magic methods, construct a serialized payload containing the gadget chain, and submit the payload to trigger object injection. The exploitation complexity increases if the attacker needs to identify suitable gadget chains, but pre-built payloads for common WordPress plugins and frameworks are often publicly available.

Detection Methods for CVE-2025-68047

Indicators of Compromise

• Unusual serialized data patterns in HTTP request parameters, cookies, or POST bodies targeting Eventin plugin endpoints
• Unexpected PHP errors related to object instantiation or magic method execution in error logs
• Evidence of file system modifications, new files created, or unauthorized database changes
• Suspicious outbound network connections originating from the web server process

Detection Strategies

• Monitor web application firewall (WAF) logs for requests containing serialized PHP object signatures (e.g., patterns starting with O:, a:, or s: followed by object definitions)
• Implement intrusion detection rules to identify unserialize() exploitation attempts in HTTP traffic
• Review WordPress audit logs for unauthorized administrative actions or plugin modifications
• Deploy endpoint detection to identify post-exploitation activities such as webshell deployment

Monitoring Recommendations

• Enable verbose PHP error logging to capture deserialization-related exceptions and warnings
• Configure real-time alerting for modifications to critical WordPress files and the wp-content directory
• Implement network monitoring to detect command and control (C2) communications following potential exploitation
• Regularly review access logs for anomalous requests to Eventin plugin endpoints

How to Mitigate CVE-2025-68047

Immediate Actions Required

• Update the Eventin (wp-event-solution) plugin to a patched version beyond 4.1.1 immediately
• If an update is not available, consider temporarily deactivating the Eventin plugin until a patch is released
• Review WordPress and server logs for evidence of exploitation attempts
• Conduct a security assessment of the WordPress installation to identify any indicators of compromise

Patch Information

Organizations should update the Eventin plugin to the latest available version that addresses this vulnerability. Refer to the Patchstack WordPress Plugin Vulnerability advisory for detailed patch information and remediation guidance.

Workarounds

• Deploy a Web Application Firewall (WAF) with rules to block serialized PHP object payloads in incoming requests
• Implement input validation at the server level to reject requests containing serialized data patterns
• Restrict access to WordPress admin and plugin functionality to trusted IP addresses where feasible
• Consider using security plugins that provide virtual patching capabilities for known WordPress vulnerabilities

# Example: Block serialized object patterns in Apache .htaccess
# Add to WordPress root .htaccess file
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{QUERY_STRING} (O:|a:|s:)[0-9]+: [NC,OR]
RewriteCond %{REQUEST_BODY} (O:|a:|s:)[0-9]+: [NC]
RewriteRule .* - [F,L]
</IfModule>