CVE-2026-24978: Jobica Core Object Injection Vulnerability

CVE-2026-24978 Overview

A deserialization of untrusted data vulnerability has been identified in the NooTheme Jobica Core WordPress plugin (jobica-core). This vulnerability allows attackers to perform PHP Object Injection attacks, potentially leading to arbitrary code execution, data manipulation, or complete site compromise. The vulnerability affects all versions of the Jobica Core plugin through version 1.4.1.

Critical Impact

Authenticated attackers with low privileges can exploit this PHP Object Injection vulnerability to execute arbitrary code, manipulate data, or gain unauthorized access to WordPress installations running vulnerable versions of the Jobica Core plugin.

Affected Products

• NooTheme Jobica Core plugin version 1.4.1 and earlier
• WordPress installations using the vulnerable jobica-core plugin
• Job board websites built with the Jobica theme ecosystem

Discovery Timeline

• 2026-03-25 - CVE CVE-2026-24978 published to NVD
• 2026-03-26 - Last updated in NVD database

Technical Details for CVE-2026-24978

Vulnerability Analysis

This vulnerability stems from improper handling of serialized data within the Jobica Core WordPress plugin. PHP Object Injection occurs when user-controllable input is passed to the unserialize() function without proper validation or sanitization. When a malicious serialized object is deserialized, it can trigger magic methods (such as __wakeup(), __destruct(), or __toString()) that may lead to dangerous operations including file operations, database queries, or code execution.

The vulnerability requires only low-privilege authentication, meaning any authenticated user (such as a subscriber or customer) could potentially exploit this flaw. This significantly increases the attack surface for WordPress sites using job board functionality provided by the Jobica Core plugin.

Root Cause

The root cause of CVE-2026-24978 is classified as CWE-502: Deserialization of Untrusted Data. The Jobica Core plugin fails to properly validate or sanitize serialized data before passing it to PHP's unserialize() function. This allows attackers to craft malicious serialized payloads that, when deserialized, instantiate objects with attacker-controlled properties. Combined with a suitable "gadget chain" of classes available in WordPress or other installed plugins, this can escalate to remote code execution.

Attack Vector

The attack is network-based and requires low-privilege authentication to the WordPress site. An attacker would craft a malicious serialized PHP object payload and submit it through a vulnerable endpoint in the Jobica Core plugin. The plugin then deserializes this payload without proper validation, triggering the attacker's chosen object instantiation and method execution chain.

The exploitation process typically involves:

1. Identifying available PHP classes (gadgets) in the WordPress environment
2. Constructing a serialized payload that chains these gadgets to achieve the desired malicious action
3. Submitting the payload through an authenticated request to the vulnerable plugin endpoint
4. The malicious object is instantiated during deserialization, executing the attack chain

For detailed technical analysis and proof-of-concept information, refer to the Patchstack Vulnerability Advisory.

Detection Methods for CVE-2026-24978

Indicators of Compromise

• Unusual serialized data patterns in HTTP POST requests containing O: or a: prefixes followed by class names
• Web server logs showing suspicious requests to Jobica Core plugin endpoints with encoded or serialized payloads
• Unexpected file modifications in the WordPress installation directory
• New or modified PHP files in unexpected locations such as /wp-content/uploads/
• Anomalous database entries or user account creations

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block serialized PHP object patterns in request parameters
• Monitor WordPress audit logs for unusual activity from low-privilege authenticated users
• Deploy file integrity monitoring to detect unauthorized changes to WordPress core, theme, and plugin files
• Analyze HTTP request logs for suspicious serialized data patterns targeting plugin endpoints

Monitoring Recommendations

• Enable verbose logging for the Jobica Core plugin and related job board functionality
• Configure real-time alerting for file system changes within the WordPress installation
• Monitor authentication logs for unusual access patterns from authenticated accounts
• Implement anomaly detection for POST requests containing serialized data structures

How to Mitigate CVE-2026-24978

Immediate Actions Required

• Update the Jobica Core plugin to the latest patched version as soon as one becomes available from NooTheme
• Review user accounts for any unauthorized creations or privilege escalations
• Audit the WordPress file system for unexpected modifications or new files
• Consider temporarily disabling the Jobica Core plugin if no patch is available and the functionality is not critical
• Implement WAF rules to filter serialized PHP object patterns in incoming requests

Patch Information

Organizations should monitor for security updates from NooTheme for the Jobica Core plugin. Check the Patchstack Vulnerability Advisory for the latest patch status and remediation guidance. Until an official patch is released, implement the workarounds described below.

Workarounds

• Temporarily disable the Jobica Core plugin if the job board functionality is not essential
• Implement strict input validation at the web server or WAF level to block serialized PHP data
• Restrict access to the WordPress admin and authenticated endpoints using IP allowlisting
• Review and remove unnecessary user accounts to minimize the attack surface
• Deploy a WordPress security plugin that can detect and block object injection attempts

# Configuration example
# Add to .htaccess to block common serialized object patterns
<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{QUERY_STRING} (O:\d+:) [NC,OR]
    RewriteCond %{REQUEST_BODY} (O:\d+:) [NC]
    RewriteRule .* - [F,L]
</IfModule>

# Disable plugin via WP-CLI if immediate mitigation is needed
wp plugin deactivate jobica-core --path=/var/www/html/wordpress