CVE-2025-52724: BoldThemes Amwerk Object Injection Flaw

CVE-2025-52724 Overview

CVE-2025-52724 is a critical deserialization of untrusted data vulnerability affecting the BoldThemes Amwerk WordPress theme. This insecure deserialization flaw allows attackers to inject malicious PHP objects into the application, potentially leading to remote code execution, privilege escalation, or complete site compromise. The vulnerability exists in all versions of Amwerk through 1.2.0.

Critical Impact

Unauthenticated attackers can exploit this PHP Object Injection vulnerability to execute arbitrary code, compromise WordPress installations, steal sensitive data, or establish persistent backdoors on affected websites.

Affected Products

• BoldThemes Amwerk WordPress Theme versions through 1.2.0
• WordPress installations using vulnerable Amwerk theme versions
• Web servers hosting affected WordPress sites

Discovery Timeline

• 2025-06-27 - CVE-2025-52724 published to NVD
• 2025-06-30 - Last updated in NVD database

Technical Details for CVE-2025-52724

Vulnerability Analysis

This vulnerability falls under CWE-502 (Deserialization of Untrusted Data), a dangerous class of flaws that occurs when applications deserialize data from untrusted sources without proper validation. In the context of the Amwerk WordPress theme, the application processes serialized PHP data without adequately verifying its integrity or sanitizing malicious content.

PHP object injection vulnerabilities are particularly severe in WordPress environments because the presence of exploitable "magic methods" (such as __wakeup(), __destruct(), or __toString()) in either the theme itself or other installed plugins can be chained together to achieve arbitrary code execution. This is commonly referred to as a Property Oriented Programming (POP) chain attack.

The network-accessible nature of this vulnerability means attackers can exploit it remotely without requiring any prior authentication or user interaction, making it highly attractive for automated exploitation campaigns targeting WordPress installations.

Root Cause

The root cause of CVE-2025-52724 lies in the improper handling of serialized PHP data within the Amwerk theme. The vulnerable code path accepts user-controlled input and passes it directly to PHP's unserialize() function without implementing proper validation, allowlisting, or integrity checks. This allows attackers to craft malicious serialized objects that, when deserialized, trigger dangerous operations through available magic methods in the application's class hierarchy.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no authentication or user interaction. An attacker can exploit this flaw by:

1. Identifying a WordPress installation using the vulnerable Amwerk theme
2. Crafting a malicious serialized PHP object payload containing references to exploitable classes
3. Submitting the payload through the vulnerable input vector (potentially via HTTP request parameters, cookies, or POST data)
4. When the application deserializes the malicious payload, the attacker's code executes with the privileges of the web server process

The exploitation typically involves chaining multiple class methods (gadget chain) to achieve the desired malicious outcome, such as writing a web shell to disk, executing system commands, or extracting sensitive database credentials.

Detection Methods for CVE-2025-52724

Indicators of Compromise

• Unexpected serialized PHP data patterns in web server access logs (look for strings starting with O: or containing :{)
• Suspicious HTTP requests to WordPress endpoints with unusually long or encoded parameters
• New or modified PHP files appearing in theme directories with unexpected content
• Unusual outbound network connections from the web server
• WordPress admin user accounts created without authorization

Detection Strategies

• Deploy web application firewalls (WAF) with rules to detect PHP serialized object patterns in request parameters
• Monitor WordPress file integrity using security plugins that alert on unauthorized file modifications
• Implement intrusion detection systems (IDS) rules to identify common PHP object injection payload signatures
• Enable and review detailed web server logging for anomalous request patterns

Monitoring Recommendations

• Configure real-time alerting for changes to theme files in wp-content/themes/amwerk/
• Monitor WordPress database for unauthorized user account creation or privilege modifications
• Set up network monitoring to detect connections to known malicious infrastructure
• Review PHP error logs for deserialization warnings or unexpected class instantiation errors

How to Mitigate CVE-2025-52724

Immediate Actions Required

• Update the Amwerk theme to a patched version if available from BoldThemes
• If no patch is available, consider temporarily disabling or replacing the Amwerk theme
• Implement WAF rules to block requests containing serialized PHP object patterns
• Audit WordPress installations for any signs of prior compromise

Patch Information

Organizations should check the Patchstack WordPress Vulnerability Advisory for the latest patch information and remediation guidance from BoldThemes. Apply vendor-provided security updates as soon as they become available.

Workarounds

• Deploy a WAF rule to filter requests containing PHP serialized object signatures (patterns matching O:[0-9]+:")
• Restrict access to WordPress admin areas and theme endpoints to trusted IP addresses where possible
• Implement PHP configuration hardening by disabling dangerous functions in php.ini if not required
• Consider switching to an alternative WordPress theme until a security patch is released

# Example WAF rule pattern for ModSecurity to block PHP object injection attempts
SecRule REQUEST_BODY "@rx O:[0-9]+:\"" "id:1001,phase:2,deny,status:403,msg:'Potential PHP Object Injection detected'"