CVE-2025-47642: Ajar in5 Embed RCE Vulnerability

CVE-2025-47642 Overview

CVE-2025-47642 is an Unrestricted Upload of File with Dangerous Type vulnerability (CWE-434) affecting the Ajar in5 Embed WordPress plugin by Ajar Productions. This vulnerability allows unauthenticated attackers to upload malicious files, including web shells, to a vulnerable web server. The flaw exists in all versions of the plugin through 3.1.5 and represents a severe security risk for WordPress sites utilizing this plugin.

Web shell upload vulnerabilities are particularly dangerous as they provide attackers with persistent remote access to compromised systems, enabling further exploitation, data theft, and lateral movement within network environments.

Critical Impact

Unauthenticated attackers can upload web shells to WordPress sites, enabling complete server compromise with the ability to execute arbitrary commands, steal sensitive data, and establish persistent backdoor access.

Affected Products

• Ajar in5 Embed WordPress plugin versions through 3.1.5
• WordPress installations with the Ajar in5 Embed plugin installed and active

Discovery Timeline

• 2025-05-23 - CVE-2025-47642 published to NVD
• 2025-05-23 - Last updated in NVD database

Technical Details for CVE-2025-47642

Vulnerability Analysis

This vulnerability stems from improper validation of file uploads within the Ajar in5 Embed WordPress plugin. The plugin fails to adequately verify the type, content, or extension of uploaded files before accepting them on the server. This allows attackers to bypass intended restrictions and upload executable files such as PHP web shells.

The vulnerability is particularly severe because it requires no authentication (unauthenticated exploitation), no user interaction, and can be exploited remotely over the network. The scope of impact extends beyond the vulnerable component itself, affecting the confidentiality, integrity, and availability of the underlying server and potentially other systems on the network.

Root Cause

The root cause of CVE-2025-47642 is the absence of proper file type validation and sanitization in the upload handling functionality. Specifically:

• The plugin does not properly validate file extensions against an allowlist of safe file types
• MIME type validation may be missing or easily bypassed
• File content inspection is not performed to detect malicious payloads
• Server-side execution permissions are not restricted for uploaded files

This combination allows attackers to upload files with executable extensions (e.g., .php, .phtml, .phar) that the web server will process as code rather than serving as static content.

Attack Vector

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

1. Identifying a WordPress site running a vulnerable version of the Ajar in5 Embed plugin
2. Locating the file upload endpoint exposed by the plugin
3. Crafting a malicious file (typically a PHP web shell) designed to evade basic validation
4. Uploading the malicious file to the server
5. Accessing the uploaded web shell via a direct URL to execute commands

Once a web shell is deployed, attackers gain the ability to execute arbitrary system commands, browse the file system, modify or delete files, exfiltrate sensitive data, and potentially pivot to other systems on the network.

The exploitation mechanism involves sending a specially crafted HTTP POST request to the vulnerable upload endpoint with a malicious PHP file. The lack of proper validation allows the server to accept and store this file in a web-accessible location, where it can then be executed by the attacker. For detailed technical analysis, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2025-47642

Indicators of Compromise

• Unexpected PHP files appearing in WordPress upload directories or plugin folders
• Web server logs showing POST requests to plugin upload endpoints followed by direct access to newly created PHP files
• Unusual outbound network connections originating from the web server process
• Process spawning from web server processes (e.g., www-data user executing shell commands)
• Presence of known web shell signatures in uploaded files

Detection Strategies

• Monitor file system changes in WordPress installation directories for new PHP files
• Implement web application firewall (WAF) rules to inspect file upload requests for malicious payloads
• Enable file integrity monitoring on WordPress directories to detect unauthorized modifications
• Analyze web server access logs for suspicious patterns of file uploads followed by immediate access

Monitoring Recommendations

• Configure alerts for new executable files created in web-accessible directories
• Implement real-time log analysis to detect POST requests to plugin endpoints with unusual file extensions
• Deploy endpoint detection and response (EDR) solutions to monitor for web shell behavior patterns
• Regularly audit WordPress plugin versions and compare against known vulnerable versions

How to Mitigate CVE-2025-47642

Immediate Actions Required

• Update the Ajar in5 Embed plugin to a patched version if available
• If no patch is available, immediately deactivate and remove the plugin from production WordPress installations
• Conduct a thorough audit of upload directories for any suspicious PHP files or web shells
• Review web server access logs for evidence of exploitation attempts or successful compromises
• Implement web application firewall rules to block malicious file upload attempts

Patch Information

According to the Patchstack vulnerability report, all versions of the Ajar in5 Embed plugin through 3.1.5 are affected. Site administrators should check for updates from the plugin vendor and apply them immediately when available. If no patch is currently available, consider removing the plugin entirely until a secure version is released.

Workarounds

• Disable or uninstall the Ajar in5 Embed plugin until a patched version is available
• Implement server-side restrictions to prevent PHP execution in upload directories using .htaccess or Nginx configuration
• Deploy a web application firewall (WAF) with rules to block file uploads containing executable content
• Restrict access to plugin upload endpoints using IP allowlisting or authentication requirements

# Apache: Add to .htaccess in upload directories to prevent PHP execution
<FilesMatch "\.(php|phtml|php3|php4|php5|php7|phps|phar)$">
    Order Deny,Allow
    Deny from all
</FilesMatch>

# Nginx: Add to server block to prevent PHP execution in uploads
location ~* /wp-content/uploads/.*\.php$ {
    deny all;
}