The vulnerability is an Insecure Direct Object Reference (IDOR) in the xxl-job-admin component. The analysis of the provided information, particularly the GitHub issue and the commits between the vulnerable version (3.1.1) and the patched version (3.2.0), revealed that several functions in JobInfoController.java were affected. The primary function mentioned in the CVE is remove, but the same vulnerability pattern and fix were applied to start and pause (which calls stop) as well.
The root cause is the lack of authorization checks in the controller methods. These methods would accept a job ID and perform an action (remove, start, stop) without verifying if the user had the rights to do so. An attacker only needed to be authenticated to the application and could then iterate through job IDs to manipulate any job in the system.
The patch, found in commit b683e65168d17f87ba4cbabdee444e19c4824e65, rectifies this by obtaining the user's login information from the HttpServletRequest and passing it down to the service layer (XxlJobServiceImpl). The service layer methods were updated to include a call to JobInfoController.hasJobGroupPermission to validate that the user belongs to the job group of the target job before executing the action. This ensures that users can only manage jobs for which they have explicit permissions.