CVE-2026-4564: RuoYi Quartz Job RCE Vulnerability

CVE-2026-4564 Overview

A code injection vulnerability has been identified in yangzongzhuan RuoYi up to version 4.8.2. This security flaw affects the Quartz Job Handler component, specifically within the /monitor/job/ file path. Attackers can exploit this vulnerability by manipulating the invokeTarget argument, enabling arbitrary code injection. The vulnerability is remotely exploitable, and a public exploit has been disclosed. Notably, the vendor was contacted regarding this disclosure but did not respond.

Critical Impact

Remote attackers with high privileges can inject and execute arbitrary code through the Quartz Job Handler's invokeTarget parameter, potentially leading to complete system compromise.

Affected Products

• yangzongzhuan RuoYi up to version 4.8.2
• Quartz Job Handler component (/monitor/job/)

Discovery Timeline

• 2026-03-23 - CVE-2026-4564 published to NVD
• 2026-03-23 - Last updated in NVD database

Technical Details for CVE-2026-4564

Vulnerability Analysis

This vulnerability falls under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), commonly known as injection. The RuoYi application fails to properly sanitize user-supplied input within the invokeTarget argument of the Quartz Job Handler. This oversight allows an authenticated attacker with elevated privileges to inject malicious code that gets executed by the application's job scheduling system.

The Quartz scheduler is a widely-used Java-based job scheduling library. When integrated into RuoYi without proper input validation, it becomes a vector for code injection attacks. The invokeTarget parameter, which normally specifies the target method or class for scheduled job execution, can be manipulated to execute arbitrary code instead of legitimate scheduled tasks.

Root Cause

The root cause of this vulnerability is insufficient input validation on the invokeTarget parameter within the Quartz Job Handler. The application does not adequately sanitize or restrict the values that can be passed to this parameter, allowing attackers to craft malicious payloads that bypass intended execution constraints. This represents a failure to implement proper input sanitization before the data is processed by the downstream Quartz scheduler component.

Attack Vector

The attack is network-based, requiring the attacker to have authenticated access with high privileges to the RuoYi administrative interface. The attacker can then navigate to the job monitoring functionality at /monitor/job/ and submit a crafted invokeTarget value containing malicious code. When the scheduled job executes, the injected code runs within the context of the application server, potentially allowing full system compromise.

The vulnerability mechanism involves the job scheduler processing the manipulated invokeTarget argument without proper validation. For detailed technical information about the exploitation technique, refer to the GitHub RCE Exploit Repository and the VulDB advisory.

Detection Methods for CVE-2026-4564

Indicators of Compromise

• Unusual job entries in the Quartz scheduler database with suspicious invokeTarget values
• Unexpected outbound network connections from the application server
• Anomalous process spawning from the Java application context
• Modified or newly created scheduled jobs with obfuscated target methods

Detection Strategies

• Monitor HTTP requests to /monitor/job/ endpoints for suspicious invokeTarget parameter values
• Implement application-level logging for all Quartz job creation and modification activities
• Deploy web application firewall (WAF) rules to detect code injection patterns in job scheduling requests
• Audit scheduled job configurations regularly for unauthorized or suspicious entries

Monitoring Recommendations

• Enable detailed audit logging for the RuoYi administrative interface
• Configure alerts for new scheduled job creation by non-standard administrative accounts
• Monitor system processes for unexpected child processes spawned by the Java runtime
• Implement network monitoring to detect unusual traffic patterns from the application server

How to Mitigate CVE-2026-4564

Immediate Actions Required

• Restrict access to the /monitor/job/ endpoint to only trusted administrators
• Implement IP-based access controls for the RuoYi administrative interface
• Review existing scheduled jobs for any suspicious or unauthorized entries
• Consider temporarily disabling the Quartz Job Handler functionality if not critical to operations

Patch Information

At the time of publication, the vendor has not responded to disclosure attempts, and no official patch is available. Organizations should implement the recommended workarounds and monitor for vendor updates. Additional technical details and community-developed mitigations may be available through the VulDB advisory.

Workarounds

• Implement strict input validation on the invokeTarget parameter using an allowlist of permitted values
• Deploy a web application firewall with rules to block code injection patterns
• Limit network access to the RuoYi application to trusted internal networks only
• Consider implementing additional authentication factors for accessing job scheduling functionality

# Example: Restrict access to job monitoring endpoint via nginx
location /monitor/job/ {
    # Allow only specific trusted IP addresses
    allow 10.0.0.0/8;
    allow 192.168.1.0/24;
    deny all;
    
    # Additional security headers
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "DENY" always;
}