CVE-2026-24548: Prince Radio Player SSRF Vulnerability

CVE-2026-24548 Overview

A Server-Side Request Forgery (SSRF) vulnerability has been identified in the Prince Radio Player WordPress plugin (radio-player). This vulnerability allows unauthenticated attackers to exploit the plugin's functionality to make arbitrary HTTP requests from the vulnerable server to internal or external resources. SSRF vulnerabilities can enable attackers to bypass network security controls, access internal services, and potentially escalate attacks against internal infrastructure.

Critical Impact

Attackers can leverage this SSRF vulnerability to probe internal network resources, access cloud metadata services, and potentially exfiltrate sensitive information from systems not directly accessible from the internet.

Affected Products

• Prince Radio Player WordPress Plugin versions through 2.0.91
• WordPress sites utilizing the Radio Player plugin for streaming audio functionality
• Web servers hosting affected WordPress installations

Discovery Timeline

• 2026-01-23 - CVE CVE-2026-24548 published to NVD
• 2026-01-26 - Last updated in NVD database

Technical Details for CVE-2026-24548

Vulnerability Analysis

This vulnerability is classified as CWE-918 (Server-Side Request Forgery), which occurs when a web application fetches a remote resource without properly validating the user-supplied URL. In the context of the Prince Radio Player plugin, the application accepts URL inputs that are intended to point to radio stream endpoints but fails to adequately restrict where these requests can be directed.

The vulnerability allows an attacker with network access to send crafted requests through the WordPress plugin, effectively using the vulnerable server as a proxy. This can be exploited to access internal resources that would otherwise be protected by network segmentation or firewall rules. The plugin processes user-provided URLs without sufficient validation, allowing requests to be made to arbitrary destinations including internal IP ranges, localhost services, and cloud provider metadata endpoints.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and URL sanitization within the Radio Player plugin. The plugin accepts user-controlled URL parameters that specify radio stream sources but does not implement proper allowlisting or blocklisting mechanisms to restrict requests to trusted external domains. This allows attackers to supply malicious URLs pointing to internal resources, localhost addresses, or cloud metadata services (such as 169.254.169.254 for AWS).

Attack Vector

The attack is network-based and can be executed by an unauthenticated attacker who can send HTTP requests to the vulnerable WordPress installation. The attacker crafts a malicious request containing a URL pointing to an internal or restricted resource. When the plugin processes this request, the server-side code makes an HTTP request to the attacker-specified destination and potentially returns the response content to the attacker.

Common exploitation scenarios include:

• Accessing internal services on localhost (e.g., http://127.0.0.1:8080/admin)
• Probing internal network ranges to discover services
• Accessing cloud provider metadata endpoints to retrieve instance credentials
• Port scanning internal networks through response timing analysis

Detection Methods for CVE-2026-24548

Indicators of Compromise

• HTTP requests originating from the WordPress server to internal IP addresses (e.g., 10.x.x.x, 172.16.x.x, 192.168.x.x)
• Requests to localhost or loopback addresses from the web application
• Outbound requests to cloud metadata endpoints (169.254.169.254)
• Unusual access patterns to the Radio Player plugin endpoints with non-standard URL parameters

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block requests containing internal IP addresses or localhost references in URL parameters
• Monitor server-side HTTP client traffic for connections to internal network ranges
• Enable logging for all outbound HTTP requests from WordPress and analyze for anomalous destinations
• Deploy SentinelOne Singularity to detect unusual network behavior patterns from web server processes

Monitoring Recommendations

• Configure network monitoring to alert on outbound connections from web servers to internal resources
• Set up alerts for requests to the Radio Player plugin with suspicious URL parameters
• Review WordPress access logs for high-frequency requests to plugin endpoints
• Implement egress filtering and monitor for attempts to reach blocked destinations

How to Mitigate CVE-2026-24548

Immediate Actions Required

• Update the Prince Radio Player plugin to a patched version as soon as one becomes available
• Temporarily disable the Radio Player plugin if it is not critical to site functionality
• Implement a web application firewall (WAF) rule to block requests containing internal IP addresses or metadata URLs
• Review server logs for evidence of exploitation attempts

Patch Information

Users should monitor the official plugin repository and the Patchstack SSRF Vulnerability Report for patch availability. Until a patch is released, implement the workarounds described below to reduce exposure.

Workarounds

• Disable the Radio Player plugin (radio-player) until a security patch is available
• Implement network-level egress filtering to prevent the web server from connecting to internal IP ranges
• Configure a WAF to validate and sanitize URL parameters before they reach the application
• Use a reverse proxy to intercept and validate all outbound HTTP requests from the application server
• Restrict the WordPress server's network access to only required external services

# Example: Block internal IP ranges at the firewall level for outbound connections
# This prevents SSRF attacks from reaching internal resources
iptables -A OUTPUT -d 10.0.0.0/8 -j DROP
iptables -A OUTPUT -d 172.16.0.0/12 -j DROP
iptables -A OUTPUT -d 192.168.0.0/16 -j DROP
iptables -A OUTPUT -d 169.254.169.254 -j DROP