CVE-2025-7787: Xuxueli Xxl-job SSRF Vulnerability

CVE-2025-7787 Overview

CVE-2025-7787 is a Server-Side Request Forgery (SSRF) vulnerability [CWE-918] in Xuxueli xxl-job up to version 3.1.1. The flaw resides in the httpJobHandler function within src\main\java\com\xxl\job\executor\service\jobhandler\SampleXxlJob.java. An authenticated remote attacker can manipulate request parameters to coerce the executor into issuing arbitrary HTTP requests. The exploit has been publicly disclosed, increasing the likelihood of opportunistic abuse against exposed xxl-job deployments.

Critical Impact

Attackers can abuse the httpJobHandler to pivot through xxl-job executors, reach internal services, and access cloud metadata endpoints that would otherwise be unreachable from the public network.

Affected Products

• Xuxueli xxl-job versions up to and including 3.1.1
• Deployments using the bundled SampleXxlJob executor handlers
• Distributed scheduling clusters relying on the httpJobHandler sample

Discovery Timeline

• 2025-07-18 - CVE-2025-7787 published to NVD
• 2026-04-29 - Last updated in NVD database

Technical Details for CVE-2025-7787

Vulnerability Analysis

xxl-job is a distributed task scheduling platform. The SampleXxlJob class ships with a reference handler named httpJobHandler that accepts a job parameter containing a URL and performs an outbound HTTP request from the executor. The implementation does not validate or restrict the destination, allowing attackers with permission to trigger jobs to direct the executor at arbitrary endpoints.

Because xxl-job executors typically run inside trusted networks, an attacker can use the handler to scan internal hosts, hit administrative APIs on localhost, or query cloud instance metadata services such as 169.254.169.254. Responses returned through job logs further amplify the impact by exposing internal data to the attacker.

Root Cause

The root cause is missing destination validation in the sample httpJobHandler. The handler parses a user-controlled URL from job parameters and dispatches the request without enforcing an allow-list, blocking link-local addresses, or filtering internal IP ranges. This pattern matches [CWE-918] Server-Side Request Forgery.

Attack Vector

Exploitation requires network reachability to the xxl-job admin or executor interface and low-privilege access sufficient to schedule a job. The attacker registers or triggers a job using httpJobHandler, supplying a target URL in the job parameter field. The executor then issues the HTTP request on the attacker's behalf and returns the response in the job log.

The vulnerability is described in prose only; no verified proof-of-concept code is provided. See the GitHub Issue Discussion for the upstream report.

Detection Methods for CVE-2025-7787

Indicators of Compromise

• Outbound HTTP requests from xxl-job executor processes to internal IP ranges, 127.0.0.1, or 169.254.169.254
• Job execution logs referencing httpJobHandler with URL parameters pointing to non-business destinations
• Unexpected job registrations created by low-privilege xxl-job accounts
• DNS lookups from executor hosts targeting cloud metadata service hostnames

Detection Strategies

• Inspect xxl-job-admin audit logs for job definitions that use httpJobHandler with externally supplied URLs
• Correlate executor egress traffic with job execution timestamps to identify SSRF-style probing
• Alert on executor processes initiating connections to RFC1918, loopback, or link-local addresses

Monitoring Recommendations

• Forward xxl-job-admin and executor logs to a centralized analytics platform and retain job parameter values
• Baseline normal executor egress destinations and alert on deviations
• Monitor for new or modified JobInfo records created outside change-management windows

How to Mitigate CVE-2025-7787

Immediate Actions Required

• Restrict access to the xxl-job-admin console to trusted administrative networks only
• Remove or disable the bundled httpJobHandler from production executors if it is not required
• Rotate xxl-job access tokens and review existing job definitions for malicious URL parameters
• Place executors behind egress filtering that blocks loopback, RFC1918, and cloud metadata addresses

Patch Information

At the time of publication, no official fixed release is referenced in the NVD entry. Track the upstream GitHub Issue Discussion and the VulDB advisory for remediation guidance and updated builds.

Workarounds

• Replace httpJobHandler with a custom handler that validates destination URLs against an allow-list
• Enforce strict authentication and role-based access on xxl-job-admin so only trusted operators can schedule jobs
• Deploy executors in a segmented network with outbound firewall rules limiting reachable hosts and ports
• Block requests to 169.254.169.254 and other metadata endpoints at the host or network layer

# Example egress restriction using iptables on an xxl-job executor host
iptables -A OUTPUT -d 169.254.169.254 -j REJECT
iptables -A OUTPUT -d 127.0.0.0/8 -p tcp -m owner --uid-owner xxljob -j REJECT
iptables -A OUTPUT -d 10.0.0.0/8 -p tcp -m owner --uid-owner xxljob -j REJECT
iptables -A OUTPUT -d 172.16.0.0/12 -p tcp -m owner --uid-owner xxljob -j REJECT
iptables -A OUTPUT -d 192.168.0.0/16 -p tcp -m owner --uid-owner xxljob -j REJECT