CVE-2025-49248

Executive Summary

CVE-2025-49248 is a Missing Authorization vulnerability in the Team Showcase WordPress plugin (slug: team-showcase-cm) developed by cmoreira. This flaw allows an unauthenticated attacker to exploit incorrectly configured access control security levels, potentially leading to unauthorized data exposure or manipulation of team member displays. The vulnerability affects all versions prior to 25.05.13. As a WordPress plugin, this issue is specific to the WordPress ecosystem and does not involve server-level software like Apache or Nginx.

The CVSS score is 4.3 (Medium), with a low attack complexity and no privileges required. The EPSS probability is 0.0%, indicating a low likelihood of active exploitation in the wild. No public proof-of-concept (PoC) code or exploit-db entry exists at this time.

Supply Chain & Package Security

This vulnerability resides in a WordPress plugin distributed via the official WordPress plugin repository. Users who installed the plugin via the WordPress admin dashboard or directly from the repository are affected. The plugin is not available on NPM, PyPI, Go, or Ruby registries. Supply chain risk is limited to the plugin’s update mechanism; users should monitor for official patches.

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): None (N) – No user action required.
• Scope (S): Unchanged (U) – Impact confined to the vulnerable component.
• Confidentiality (C): None (N) – No data disclosure.
• Integrity (I): Low (L) – Limited ability to modify data.
• Availability (A): None (N) – No denial of service.

Threat Level: Medium. The vulnerability is easy to exploit but has limited impact. However, in a WordPress multisite or shared hosting environment, the integrity impact could be amplified.

Deep Dive & Mechanics

The vulnerability stems from missing authorization checks in the plugin’s AJAX handlers or REST endpoints. The plugin likely exposes functions to create, read, update, or delete team member entries without verifying the user’s capabilities (e.g., edit_posts or manage_options). An unauthenticated attacker can send crafted HTTP requests to these endpoints to:

• Modify team member details (names, images, descriptions).
• Delete existing team members.
• Potentially inject malicious content (e.g., XSS payloads) if input sanitization is also absent.

The root cause is the failure to call current_user_can() or wp_verify_nonce() before executing sensitive operations. This is a classic CWE-862 (Missing Authorization) pattern in WordPress plugins.

Vulnerable vs. Patched Code

Vulnerable Code (hypothetical example):

add_action('wp_ajax_nopriv_update_team_member', 'update_team_member_handler');
function update_team_member_handler() {
    $member_id = $_POST['member_id'];
    $name = $_POST['name'];
    // No capability check
    update_post_meta($member_id, 'team_member_name', $name);
    wp_die();
}

Patched Code (expected fix):

add_action('wp_ajax_update_team_member', 'update_team_member_handler');
function update_team_member_handler() {
    if (!current_user_can('edit_posts')) {
        wp_die('Unauthorized', 403);
    }
    if (!wp_verify_nonce($_POST['_wpnonce'], 'update_team_member_nonce')) {
        wp_die('Nonce verification failed', 403);
    }
    $member_id = intval($_POST['member_id']);
    $name = sanitize_text_field($_POST['name']);
    update_post_meta($member_id, 'team_member_name', $name);
    wp_die();
}

The patch removes the nopriv (no privilege) AJAX action and adds capability and nonce checks.

Exploitation & Lab Setup

Red Team (Proof of Concept)

Since no public exploit exists, the following is a conceptual demonstration. Replace target.com with the victim site.

# Step 1: Enumerate vulnerable endpoints
curl -s "https://target.com/wp-admin/admin-ajax.php?action=team_showcase_get_members" | jq .

# Step 2: Attempt unauthorized update (if endpoint exists)
curl -X POST "https://target.com/wp-admin/admin-ajax.php" \
  -d "action=update_team_member&member_id=1&name=HACKED" \
  -H "Content-Type: application/x-www-form-urlencoded"

Expected Result: The team member name changes without authentication.

Blue Team (Detection & Hardening)

1. Monitor AJAX requests to admin-ajax.php with suspicious action parameters (e.g., team_showcase_*).
2. Check for missing nonces in plugin code.
3. Apply virtual patching via WAF rules (see Suricata below).
4. Disable the plugin until an official patch is released.

Indicators of Compromise (IOCs)

• Network: HTTP POST requests to /wp-admin/admin-ajax.php with action=team_showcase_* parameters from unauthenticated sources.
• File: Modified wp_postmeta entries where meta_key contains team_member_* and meta_value shows unexpected content.
• Log: WordPress debug log entries showing wp_ajax_nopriv_* calls without corresponding user sessions.

Detection Engineering

YARA Rule

rule CVE_2025_49248_Team_Showcase_Missing_Auth {
    meta:
        description = "Detects missing authorization in Team Showcase plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-49248"
    strings:
        $ajax_nopriv = "wp_ajax_nopriv_" nocase
        $team_showcase = "team_showcase" nocase
        $missing_cap = "current_user_can" nocase
    condition:
        $ajax_nopriv and $team_showcase and not $missing_cap
}

Sigma Rule

title: CVE-2025-49248 - Team Showcase Missing Authorization
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects unauthenticated AJAX requests to Team Showcase endpoints
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        c-uri|contains: '/wp-admin/admin-ajax.php'
        cs-uri-query|contains: 'action=team_showcase_'
    condition: selection
falsepositives:
    - Legitimate admin actions (rare)
level: medium

Suricata Rule

alert http any any -> any any (
    msg:"CVE-2025-49248 - Team Showcase Missing Authorization Attempt";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/wp-admin/admin-ajax.php"; http_uri;
    content:"action=team_showcase_"; http_client_body;
    classtype:attempted-recon;
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

1. Immediate: Disable the Team Showcase plugin until a patched version (>= 25.05.13) is confirmed.
2. Short-term: Implement a Web Application Firewall (WAF) rule to block unauthenticated requests to admin-ajax.php with action=team_showcase_*.
3. Long-term: Update to the latest version once the vendor releases a fix. If no patch is forthcoming, consider replacing the plugin with an alternative.
4. Code-level: Ensure all AJAX handlers check current_user_can() and wp_verify_nonce().

Valters IT
DevSecOps & Cyber Threat Intelligence Division