CVE-2025-31862

Executive Summary

CVE-2025-31862 is a Missing Authorization vulnerability in the PickPlugins Job Board Manager WordPress plugin, affecting versions up to and including 2.1.61. This flaw allows unauthenticated attackers to exploit incorrectly configured access control security levels, potentially leading to unauthorized data exposure or manipulation of job board listings. The vulnerability is classified as a WordPress ecosystem issue, not related to Apache or Nginx. With a CVSS score of 5.3 (Medium), it poses a moderate risk, but the lack of a known patch and public exploit code increases the urgency for mitigation. The EPSS score is 0.0%, indicating low exploitation likelihood currently, but the vulnerability remains exploitable.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository. Users must ensure they are using a patched version once available, and implement strict access controls in the interim.

CVSS Breakdown & Threat Level

• CVSS Score: 5.3 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: None
• User Interaction: None
• Scope: Unchanged
• Confidentiality Impact: Low
• Integrity Impact: None
• Availability Impact: None

The threat level is Medium due to the low complexity and no authentication requirement, but the impact is limited to confidentiality.

Deep Dive & Mechanics

The vulnerability resides in the Job Board Manager plugin's REST API or AJAX handlers, where authorization checks are missing or improperly implemented. Attackers can send crafted HTTP requests to endpoints that should require administrative or editor privileges, but due to missing capability checks, they can access or modify job listings, applicant data, or plugin settings.

Root Cause: The plugin fails to call current_user_can() or similar WordPress capability functions before processing sensitive actions. This allows any unauthenticated user to trigger functions that should be restricted.

Attack Vector: An attacker sends a GET or POST request to a vulnerable endpoint (e.g., /wp-json/job-board-manager/v1/jobs or an AJAX action) without any authentication token.

Impact: Unauthorized reading of job postings, applicant details, or configuration data. In some cases, the attacker might be able to create or delete job listings if the missing authorization extends to write operations.

Vulnerable vs. Patched Code

Since no patch is available, we can only hypothesize the fix. The vulnerable code likely looks like:

// Vulnerable: No capability check
add_action('wp_ajax_nopriv_job_board_manager_get_jobs', 'get_jobs_callback');
function get_jobs_callback() {
    $jobs = get_posts(array('post_type' => 'job_listing'));
    wp_send_json($jobs);
}

The patched version would include:

// Patched: Check user capability
add_action('wp_ajax_nopriv_job_board_manager_get_jobs', 'get_jobs_callback');
function get_jobs_callback() {
    if (!current_user_can('edit_posts')) {
        wp_die('Unauthorized', 403);
    }
    $jobs = get_posts(array('post_type' => 'job_listing'));
    wp_send_json($jobs);
}

Exploitation & Lab Setup

Red Team

Prerequisites: A WordPress site with Job Board Manager <= 2.1.61 installed and active.

Exploitation Steps:

1. Identify Vulnerable Endpoint: Use a tool like Burp Suite or curl to probe for AJAX actions or REST endpoints. Common endpoints include:

   • /wp-admin/admin-ajax.php?action=job_board_manager_get_jobs
   • /wp-json/job-board-manager/v1/jobs

2. Craft Request: Send an unauthenticated GET request to the endpoint.

   curl -X GET "http://target.com/wp-admin/admin-ajax.php?action=job_board_manager_get_jobs"
   

3. Extract Data: If successful, the response will contain job listings or other sensitive data in JSON format.

Note: No public exploit code is available, so this is a generic approach.

Blue Team

Detection & Prevention:

• Monitor Logs: Look for unusual requests to AJAX actions or REST endpoints without authentication cookies.
• Web Application Firewall (WAF): Block requests to known vulnerable endpoints from unauthenticated users.
• Plugin Hardening: Disable the plugin until a patch is available, or implement custom capability checks via a mu-plugin.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP requests to /wp-admin/admin-ajax.php with action=job_board_manager_* parameters from unauthenticated sources.
  • Unusual JSON responses containing job listings or applicant data.
• File IOCs:
  • Modified plugin files in /wp-content/plugins/job-board-manager/ (if attacker gains write access).
• Log IOCs:
  • Repeated 200 responses to AJAX endpoints without prior login events.

Detection Engineering

YARA Rule

rule Detect_CVE_2025_31862_Exploit {
    meta:
        description = "Detects exploitation attempts for CVE-2025-31862 in Job Board Manager plugin"
        author = "Valters IT"
        date = "2025-04-17"
        reference = "CVE-2025-31862"
    strings:
        $ajax_action = "job_board_manager_" nocase
        $rest_route = "/job-board-manager/" nocase
        $unauth_access = "wp_ajax_nopriv_" nocase
    condition:
        any of ($ajax_action, $rest_route) and $unauth_access
}

Sigma Rule

title: CVE-2025-31862 - Missing Authorization in Job Board Manager
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects unauthenticated access to Job Board Manager AJAX endpoints
author: Valters IT
date: 2025/04/17
logsource:
    category: webserver
    product: apache
    service: access_combined
detection:
    selection:
        cs-uri-query|contains: 
            - 'action=job_board_manager_'
            - '/job-board-manager/'
        sc-status: 200
    condition: selection
falsepositives:
    - Legitimate authenticated users (check for cookie presence)
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-31862 - Job Board Manager Unauthenticated Access"; flow:to_server; content:"/wp-admin/admin-ajax.php"; http_uri; content:"action=job_board_manager_"; http_uri; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate Action: Disable the Job Board Manager plugin until a patch is released.
2. Workaround: Implement a custom mu-plugin that adds capability checks to all AJAX and REST endpoints.
3. Patch: Monitor the WordPress plugin repository for an update. Once available, update to version > 2.1.61.
4. Long-term: Regularly audit WordPress plugins for missing authorization vulnerabilities using tools like WPScan.

Valters IT
Securing Digital Frontiers