CVE-2025-46264: PowerPress Podcasting RCE Vulnerability

CVE-2025-46264 Overview

CVE-2025-46264 is an Unrestricted Upload of File with Dangerous Type vulnerability (CWE-434) affecting the blubrry PowerPress Podcasting plugin for WordPress. This vulnerability allows attackers to upload malicious files, including web shells, to vulnerable web servers running affected versions of the plugin.

The vulnerability stems from insufficient file type validation in the plugin's upload functionality, enabling attackers to bypass security controls and upload arbitrary files with dangerous extensions. Once a web shell is successfully uploaded, attackers can execute arbitrary commands on the server, potentially leading to complete system compromise.

Critical Impact

Attackers can upload web shells to WordPress servers running PowerPress Podcasting plugin versions through 11.12.5, enabling remote code execution and full server compromise.

Affected Products

• blubrry PowerPress Podcasting plugin for WordPress (versions through 11.12.5)

Discovery Timeline

• 2025-04-24 - CVE-2025-46264 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2025-46264

Vulnerability Analysis

This vulnerability represents a classic Unrestricted File Upload flaw where the PowerPress Podcasting plugin fails to properly validate and restrict the types of files that can be uploaded through its interface. The plugin's upload functionality does not adequately verify file extensions, MIME types, or file content before accepting uploads.

When a WordPress plugin allows arbitrary file uploads without proper validation, attackers can exploit this weakness to upload executable scripts such as PHP web shells. Once uploaded, these malicious files can be accessed directly through the web server, granting the attacker the ability to execute arbitrary code in the context of the web server process.

The impact of successful exploitation is severe, as web shell access typically provides attackers with:

• Complete control over the WordPress installation
• Access to sensitive database credentials and content
• Ability to pivot to other systems on the network
• Capability to install backdoors for persistent access
• Potential to compromise other sites on shared hosting environments

Root Cause

The root cause of CVE-2025-46264 lies in insufficient input validation within the PowerPress Podcasting plugin's file upload handling mechanism. The plugin fails to implement adequate server-side validation of uploaded files, relying potentially on client-side checks or insufficient MIME type verification that can be easily bypassed.

Proper file upload security requires multiple layers of validation including:

• Whitelist-based file extension checking
• MIME type verification against actual file content
• File content scanning for malicious signatures
• Randomized file naming to prevent direct access
• Storage outside the webroot when possible

The absence of one or more of these controls in affected versions allows attackers to circumvent any basic restrictions and upload executable PHP files disguised as legitimate media content.

Attack Vector

The attack vector for this vulnerability involves an attacker with access to the plugin's upload functionality submitting a malicious PHP file. The attack typically follows this pattern:

1. Reconnaissance: The attacker identifies a WordPress site running a vulnerable version of PowerPress Podcasting
2. Payload Preparation: A PHP web shell is crafted, potentially with obfuscation to evade basic detection
3. Upload Bypass: The malicious file is uploaded using techniques such as double extensions (e.g., shell.php.jpg), null byte injection, or MIME type spoofing
4. Shell Access: Once uploaded, the attacker navigates to the uploaded file's URL to execute the web shell
5. Post-Exploitation: With web shell access, the attacker can execute system commands, access the database, and establish persistence

For detailed technical information, see the Patchstack Vulnerability Database Entry.

Detection Methods for CVE-2025-46264

Indicators of Compromise

• Presence of unexpected PHP files in WordPress upload directories, particularly in wp-content/uploads/powerpress/ or similar plugin-specific paths
• Web server logs showing requests to unusual PHP files in upload directories with command execution parameters
• Newly created or modified PHP files with obfuscated code, base64_decode(), eval(), or system() function calls
• Unexpected outbound network connections from the web server process

Detection Strategies

• Implement file integrity monitoring on WordPress directories to alert on unexpected PHP file creation
• Deploy web application firewalls (WAF) with rules to detect and block web shell upload attempts
• Monitor web server access logs for POST requests to plugin upload endpoints followed by GET requests to non-standard PHP files
• Use security plugins to scan for known web shell signatures and suspicious file patterns

Monitoring Recommendations

• Enable real-time file system monitoring for WordPress installations, particularly the wp-content/uploads/ directory tree
• Configure alerts for new PHP file creation in directories that should only contain media files
• Implement regular automated scans using WordPress security plugins such as Wordfence or Sucuri
• Review web server logs for anomalous request patterns targeting plugin upload endpoints

How to Mitigate CVE-2025-46264

Immediate Actions Required

• Update the PowerPress Podcasting plugin to version 11.12.6 or later immediately
• Audit the WordPress wp-content/uploads/ directory for any suspicious PHP or executable files
• Review web server access logs for evidence of exploitation attempts or successful compromises
• If compromise is suspected, restore from a known-good backup and perform full forensic analysis

Patch Information

Blubrry has addressed this vulnerability in versions after 11.12.5. Users should update to version 11.12.6 or later to remediate this vulnerability. The patch implements proper file type validation to prevent the upload of dangerous file types.

For additional details regarding the patch, refer to the Patchstack Vulnerability Database Entry.

Workarounds

• Temporarily disable the PowerPress Podcasting plugin until it can be updated to a patched version
• Implement web server configuration to prevent PHP execution in upload directories (see configuration example below)
• Restrict access to WordPress admin and plugin functionality to trusted IP addresses only
• Deploy a web application firewall with rules to block file upload attacks

# Apache .htaccess configuration to prevent PHP execution in uploads directory
# Place this in wp-content/uploads/.htaccess
<Files *.php>
    Deny from all
</Files>

# Alternative: Disable all script execution
<Directory "/var/www/html/wp-content/uploads">
    php_admin_flag engine off
    RemoveHandler .php .phtml .php3 .php4 .php5 .php7 .phps .phar
    AddHandler txt .php .phtml .php3 .php4 .php5 .php7 .phps .phar
</Directory>