CVE-2025-47629: WP-CRM System Object Injection Vulnerability

CVE-2025-47629 Overview

CVE-2025-47629 is a PHP Object Injection vulnerability in the WP-CRM System plugin for WordPress, developed by Mario Peshev. The flaw stems from deserialization of untrusted data [CWE-502] and affects all versions up to and including 3.4.5. Authenticated attackers with high privileges can inject crafted serialized objects that the plugin unserializes, triggering PHP magic methods within available gadget chains. Successful exploitation can lead to arbitrary code execution, file manipulation, or full compromise of the WordPress installation.

Critical Impact
An authenticated attacker can leverage object injection to execute arbitrary PHP code, modify site content, and pivot to full site takeover when a suitable gadget chain exists in the WordPress environment.

Affected Products

WP-CRM System WordPress plugin versions up to and including 3.4.5
WordPress sites running the vulnerable wp-crm-system plugin
Multi-site WordPress deployments with the plugin network-activated

Discovery Timeline

2025-05-07 - CVE-2025-47629 published to NVD
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-47629

Vulnerability Analysis

The WP-CRM System plugin passes attacker-controllable input to PHP's unserialize() function without validation. When PHP unserializes a string, it instantiates objects and invokes magic methods such as __wakeup() and __destruct(). If the WordPress runtime contains classes whose magic methods perform sensitive operations, an attacker can chain them into a property-oriented programming (POP) gadget chain.

The vulnerability requires authenticated access with elevated privileges, which constrains the attack population but does not eliminate risk. Compromised administrator credentials, insider abuse, or chained privilege escalation can satisfy the authentication requirement. Once triggered, the impact spans confidentiality, integrity, and availability of the WordPress site.

Root Cause

The root cause is unsafe deserialization of user-supplied data within the plugin's request handlers. The code calls unserialize() on input that traverses user-controlled fields rather than restricting input to safe formats such as JSON. PHP automatically resolves class definitions during unserialization, enabling object instantiation without explicit code paths in the plugin itself.

Attack Vector

The attack vector is network-based and requires authentication. An attacker with the necessary plugin permissions submits a payload containing a serialized PHP object to a vulnerable plugin endpoint. The plugin deserializes the payload, instantiating the attacker's chosen class hierarchy. Gadget chains present in WordPress core, other active plugins, or themes then complete the exploitation path, leading to file write, file read, or code execution outcomes.

No public proof-of-concept is currently documented for this CVE. Refer to the Patchstack WordPress Vulnerability Report for additional technical context.

Detection Methods for CVE-2025-47629

Indicators of Compromise

Unexpected outbound network connections originating from the php-fpm or web server process after WP-CRM endpoints are accessed
New or modified PHP files in wp-content/uploads/, wp-content/plugins/, or theme directories
HTTP POST requests to WP-CRM plugin endpoints containing serialized payloads beginning with O:, a:, or s: followed by length and class data
WordPress administrator accounts created or modified outside of normal change windows

Detection Strategies

Inspect web server access logs for requests to wp-crm-system endpoints containing URL-encoded serialized PHP object patterns
Monitor WordPress audit logs for option changes, user role escalations, or plugin file edits performed by accounts with WP-CRM access
Deploy file integrity monitoring across the WordPress document root to flag unauthorized PHP file additions or modifications

Monitoring Recommendations

Forward WordPress, PHP, and web server logs to a centralized SIEM for correlation against authentication and file-change events
Alert on unserialize()-style payload patterns in HTTP request bodies via a web application firewall
Track plugin version inventory across all WordPress instances to identify hosts still running WP-CRM System 3.4.5 or earlier

How to Mitigate CVE-2025-47629

Immediate Actions Required

Update WP-CRM System to a version newer than 3.4.5 as soon as the vendor publishes a patched release
Audit all WordPress accounts with WP-CRM privileges and remove unnecessary high-privilege access
Rotate credentials for administrator and editor accounts that interact with the plugin
Review web server and WordPress audit logs for prior exploitation indicators dating back to plugin installation

Patch Information

Review the Patchstack WordPress Vulnerability Report for vendor patch availability and upgrade guidance. Apply the fixed version across all WordPress instances and verify the plugin version after deployment.

Workarounds

Deactivate and remove the WP-CRM System plugin until a patched version is available and tested
Restrict access to WordPress administrative endpoints using IP allow-listing at the web server or reverse proxy
Deploy a web application firewall rule that blocks request bodies containing PHP serialized object signatures targeting plugin endpoints
Enforce multi-factor authentication for all WordPress accounts capable of triggering the vulnerable code path

bash

# Example nginx rule to block serialized PHP object payloads to WP-CRM endpoints
location ~* /wp-content/plugins/wp-crm-system/ {
    if ($request_body ~* "(O|a):[0-9]+:\"") {
        return 403;
    }
}