CVE-2025-69371: KindlyCare Object Injection Vulnerability

CVE-2025-69371 Overview

A critical insecure deserialization vulnerability has been identified in the AncoraThemes KindlyCare WordPress theme. This vulnerability allows unauthenticated attackers to inject malicious PHP objects through untrusted data deserialization, potentially leading to remote code execution, data manipulation, or complete site compromise.

Critical Impact

Unauthenticated attackers can exploit PHP object injection to achieve remote code execution, access sensitive data, or completely compromise WordPress installations using vulnerable KindlyCare theme versions.

Affected Products

• AncoraThemes KindlyCare WordPress Theme versions up to and including 1.6.1
• All WordPress installations utilizing the KindlyCare theme
• Sites where the theme is installed but not actively used

Discovery Timeline

• 2026-02-20 - CVE CVE-2025-69371 published to NVD
• 2026-02-24 - Last updated in NVD database

Technical Details for CVE-2025-69371

Vulnerability Analysis

This vulnerability stems from the unsafe deserialization of user-controlled data within the KindlyCare WordPress theme (CWE-502). PHP's unserialize() function, when processing untrusted input, can be exploited to instantiate arbitrary objects with attacker-controlled properties. When combined with existing classes containing exploitable magic methods (known as "gadget chains"), this allows attackers to achieve various malicious outcomes including remote code execution.

The network-accessible nature of WordPress themes means this vulnerability can be exploited remotely without requiring any authentication or user interaction. An attacker simply needs to craft a malicious serialized PHP object and submit it through the vulnerable entry point.

Root Cause

The root cause is the use of PHP's unserialize() function on data that can be influenced by external users without proper validation or sanitization. The KindlyCare theme fails to implement adequate input filtering before deserializing user-supplied data, allowing malicious serialized objects to be processed by the application.

Attack Vector

The attack is conducted over the network against WordPress sites running the vulnerable theme. An attacker crafts a malicious serialized PHP object containing properties designed to trigger dangerous operations when the object is instantiated or destroyed. The serialized payload is submitted through a vulnerable input field or parameter, and when the theme deserializes this data, the malicious object is created and its magic methods (__wakeup(), __destruct(), etc.) execute the attacker's intended operations.

The exploitation requires identifying suitable "gadget chains" - existing PHP classes in WordPress core, plugins, or the theme itself that contain magic methods performing dangerous operations when their properties contain attacker-controlled values.

Detection Methods for CVE-2025-69371

Indicators of Compromise

• Unexpected serialized PHP data in web server access logs, particularly containing strings like O: followed by class names
• Unusual file modifications or new files appearing in theme directories
• PHP error logs showing object instantiation failures or unexpected class loading
• Web application firewall logs showing blocked serialization patterns

Detection Strategies

• Implement web application firewall rules to detect serialized PHP object patterns in request parameters
• Monitor server logs for requests containing encoded serialization markers (O:, a:, s:)
• Deploy file integrity monitoring on WordPress installations to detect unauthorized changes
• Use security scanning tools that specifically test for PHP object injection vulnerabilities

Monitoring Recommendations

• Enable comprehensive logging for all WordPress theme-related requests
• Configure alerting for suspicious patterns in serialized data submissions
• Implement real-time monitoring of file system changes in WordPress directories
• Review access logs for anomalous POST requests targeting theme endpoints

How to Mitigate CVE-2025-69371

Immediate Actions Required

• Update the KindlyCare theme to a patched version as soon as one becomes available from AncoraThemes
• Consider temporarily disabling or replacing the KindlyCare theme until a patch is released
• Implement web application firewall rules to block requests containing serialized PHP objects
• Review server logs for any indicators of prior exploitation attempts

Patch Information

Organizations should monitor the Patchstack Vulnerability Database Entry for updates on official patches from AncoraThemes. Until a vendor patch is available, implement the workarounds described below to reduce exposure.

Workarounds

• Deploy a web application firewall with rules specifically designed to detect and block PHP object injection attempts
• Implement server-side input validation to reject any input containing serialized PHP patterns
• Consider using WordPress security plugins that provide object injection protection
• Restrict access to WordPress admin areas using IP allowlisting where possible

# Example ModSecurity rule to block serialized PHP objects
SecRule ARGS "@rx (^|[;|])O:\d+:\"[a-zA-Z_\\x7f-\\xff][a-zA-Z0-9_\\x7f-\\xff]*\":\d+:{" \
    "id:1001,\
    phase:2,\
    deny,\
    log,\
    msg:'PHP Object Injection Attempt Detected',\
    severity:CRITICAL"