CVE-2025-7788: Xuxueli Xxl-job RCE Vulnerability

CVE-2025-7788 Overview

CVE-2025-7788 is an operating system (OS) command injection vulnerability in Xuxueli xxl-job versions up to 3.1.1. The flaw resides in the commandJobHandler function within src/main/java/com/xxl/job/executor/service/jobhandler/SampleXxlJob.java. An authenticated remote attacker can manipulate job parameters to execute arbitrary OS commands on the executor host. The exploit details have been disclosed publicly, increasing the likelihood of opportunistic abuse against exposed deployments. The vulnerability is tracked under [CWE-77] Command Injection and [CWE-78] OS Command Injection.

Critical Impact

Remote attackers with low privileges can inject arbitrary OS commands through the commandJobHandler task handler in xxl-job executors.

Affected Products

• Xuxueli xxl-job versions up to and including 3.1.1
• Deployments using the bundled SampleXxlJob executor sample
• Self-hosted xxl-job admin instances exposing the executor RPC interface

Discovery Timeline

• 2025-07-18 - CVE-2025-7788 published to the National Vulnerability Database (NVD)
• 2026-04-29 - Last updated in NVD database
• Tracking record available via the GitHub Issue Report and VulDB #316849

Technical Details for CVE-2025-7788

Vulnerability Analysis

Xxl-job is a widely deployed distributed task scheduling platform written in Java. The commandJobHandler in SampleXxlJob.java accepts a job parameter string supplied by the scheduler and passes it to a runtime process executor. The handler treats the parameter as an OS command line and invokes it without sanitization, escaping, or allowlisting. An attacker who can submit or modify a scheduled job through the admin interface or RPC channel can supply arbitrary shell payloads. Execution occurs in the context of the executor process, typically running with privileges sufficient to read application secrets, pivot to backend databases, or move laterally within the cluster.

Root Cause

The root cause is the use of unvalidated user-controlled input as the argument to a process invocation API. The sample handler was designed to demonstrate OS-level task execution but ships as a default registered handler in production builds. Because input validation, command allowlisting, and process sandboxing are absent, any caller able to dispatch a job to the executor controls the executed command line ([CWE-78]).

Attack Vector

Exploitation requires network access to the xxl-job admin console or executor RPC endpoint and an authenticated session with permission to create or trigger tasks. The attacker creates a new job referencing commandJobHandler and sets the job parameter to a malicious command string (for example, chained shell operators followed by attacker-controlled binaries). When the scheduler triggers the task, the executor process invokes the command and returns output through the standard xxl-job logging channel, giving the attacker confirmation of execution. Because xxl-job clusters frequently run with elevated service accounts, successful exploitation often yields meaningful host control.

No verified proof-of-concept code has been published in the references. Refer to the GitHub Issue Report for upstream discussion of the affected handler.

Detection Methods for CVE-2025-7788

Indicators of Compromise

• Executor process (java running xxl-job-executor) spawning child processes such as sh, bash, cmd.exe, powershell.exe, curl, wget, or nc
• New or modified job entries in the xxl-job admin database referencing commandJobHandler with unusual parameter strings
• Outbound network connections from executor hosts to unfamiliar IP addresses shortly after scheduled job triggers
• xxl-job execution logs containing shell metacharacters such as ;, &&, |, or backticks in the job parameter field

Detection Strategies

• Hunt for parent-child process relationships where the xxl-job executor JVM spawns shell interpreters or download utilities
• Alert on creation or modification of jobs whose executorHandler value equals commandJobHandler
• Inspect xxl-job admin audit logs for job parameter values containing OS command separators or encoded payloads

Monitoring Recommendations

• Forward xxl-job admin audit logs and executor stdout/stderr to a centralized logging platform for correlation
• Baseline normal child processes spawned by the executor JVM and alert on deviations
• Monitor egress traffic from executor hosts and flag connections to non-corporate destinations following job execution events

How to Mitigate CVE-2025-7788

Immediate Actions Required

• Restrict network access to xxl-job admin and executor ports to trusted management networks only
• Remove or disable the commandJobHandler registration in SampleXxlJob.java if it is not required
• Rotate xxl-job admin credentials and enforce strong, unique passwords with multi-factor authentication on any fronting proxy
• Audit existing scheduled jobs for unexpected entries referencing commandJobHandler or suspicious parameter strings

Patch Information

At the time of NVD publication, the upstream project tracks the issue at the GitHub Issue Report. Operators should monitor the xuxueli/xxl-job repository for releases beyond 3.1.1 and apply fixes as soon as they are published. Until a patched release is available, treat the sample command handler as unsafe in production.

Workarounds

• Delete commandJobHandler from the executor handler registry to prevent any job from invoking OS commands
• Run executors under a least-privilege service account confined by SELinux, AppArmor, or a container security profile
• Place the xxl-job admin console behind a reverse proxy that enforces authentication, IP allowlisting, and request logging
• Implement a job-creation review workflow so handler and parameter changes require approval before activation

# Configuration example: remove the vulnerable handler registration
# In SampleXxlJob.java, comment out or delete the @XxlJob("commandJobHandler") method
# Then rebuild and redeploy the executor:
mvn clean package -DskipTests
systemctl restart xxl-job-executor