CVE-2025-69035: Dental Care CPT Object Injection Flaw

CVE-2025-69035 Overview

A deserialization of untrusted data vulnerability has been identified in the Dental Care CPT WordPress plugin developed by strongholdthemes. This PHP Object Injection vulnerability (CWE-502) allows attackers to inject malicious serialized objects into the application, potentially leading to remote code execution, data manipulation, or other security compromises depending on available gadget chains within the WordPress installation.

Critical Impact

Successful exploitation of this PHP Object Injection vulnerability could allow attackers to execute arbitrary code, access sensitive data, or compromise the underlying WordPress installation through malicious deserialization.

Affected Products

• Dental Care CPT plugin versions from n/a through 20.2
• WordPress installations running vulnerable versions of the dentalcare-cpt plugin

Discovery Timeline

• 2026-01-22 - CVE CVE-2025-69035 published to NVD
• 2026-01-22 - Last updated in NVD database

Technical Details for CVE-2025-69035

Vulnerability Analysis

This vulnerability falls under CWE-502 (Deserialization of Untrusted Data), a critical class of security flaws that occurs when an application deserializes data from untrusted sources without proper validation. In the context of WordPress plugins like Dental Care CPT, PHP's unserialize() function is particularly dangerous when processing user-controlled input.

When a PHP application deserializes attacker-controlled data, it can instantiate arbitrary objects and trigger magic methods such as __wakeup(), __destruct(), or __toString(). If the WordPress installation contains classes with dangerous implementations of these methods (known as "gadget chains"), an attacker can chain them together to achieve various malicious outcomes including remote code execution.

Root Cause

The root cause of this vulnerability is the improper handling of serialized data within the Dental Care CPT plugin. The plugin processes user-supplied serialized input without adequate validation or sanitization, passing it directly to PHP's unserialize() function. This allows attackers to craft malicious serialized payloads that, when deserialized, instantiate objects with dangerous side effects.

Attack Vector

The attack vector involves sending specially crafted serialized PHP objects to the vulnerable plugin endpoint. An attacker would typically:

1. Identify input parameters that accept serialized data
2. Analyze the WordPress installation for available gadget chains (classes with exploitable magic methods)
3. Craft a malicious serialized payload that leverages these gadget chains
4. Submit the payload to the vulnerable plugin, triggering deserialization and exploitation

The vulnerability can be exploited by submitting malicious serialized PHP objects to the plugin. When the application processes this input through unserialize(), the attacker-controlled objects are instantiated, potentially executing arbitrary code or performing other malicious actions. For detailed technical information about this vulnerability, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2025-69035

Indicators of Compromise

• Unusual HTTP requests containing serialized PHP objects (base64 encoded or raw serialized strings starting with O:, a:, or s:)
• Unexpected file creation or modification in WordPress directories
• Suspicious PHP error logs indicating deserialization failures or object instantiation errors
• Web server logs showing requests with abnormally long parameters or encoded payloads

Detection Strategies

• Monitor web application logs for requests containing serialized PHP data patterns (e.g., O:[0-9]+:")
• Implement Web Application Firewall (WAF) rules to detect and block serialized object injection attempts
• Use file integrity monitoring to detect unauthorized changes to WordPress core, plugin, or theme files
• Deploy runtime application security monitoring to detect anomalous deserialization behavior

Monitoring Recommendations

• Enable verbose logging on the WordPress installation to capture suspicious plugin activity
• Configure security information and event management (SIEM) alerts for PHP object injection patterns
• Monitor outbound network connections from the web server for potential command and control traffic
• Regularly audit installed plugins and their versions against known vulnerability databases

How to Mitigate CVE-2025-69035

Immediate Actions Required

• Update the Dental Care CPT plugin to a patched version if available from the vendor
• If no patch is available, consider temporarily disabling the plugin until a fix is released
• Audit all WordPress plugins for similar deserialization vulnerabilities
• Implement input validation at the application layer to reject serialized data where not explicitly required

Patch Information

Organizations should check the Patchstack WordPress Vulnerability Report for the latest patch information and remediation guidance from the vendor. If running Dental Care CPT version 20.2 or earlier, an update or workaround should be applied immediately.

Workarounds

• Temporarily disable the Dental Care CPT plugin if it is not critical to site functionality
• Implement a Web Application Firewall (WAF) rule to block requests containing serialized PHP object patterns
• Restrict access to the affected plugin endpoints through .htaccess or server configuration
• Consider using PHP's allowed_classes parameter with unserialize() at the code level if custom modifications are feasible

# Example .htaccess rule to restrict access to plugin directory
<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{REQUEST_URI} ^/wp-content/plugins/dentalcare-cpt/ [NC]
    RewriteCond %{QUERY_STRING} (O:|a:|s:)[0-9]+: [NC]
    RewriteRule .* - [F,L]
</IfModule>