# CVE-2026-108637

## Summary

- **CVE ID:** CVE-2026-108637
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-862
- **Published:** Oct 10, 2026
- **Last Modified:** Oct 10, 2026

## Description

JeecgBoot through 3.9.5 contains a missing authorization vulnerability that allows low-privileged authenticated users to remove user group members by calling DELETE /sys/user/deleteUserGroupBatch. Attackers can supply any groupId and comma-separated userIds to delete sys_ugroup_user rows without permission or tenant checks, tampering with administrator-maintained groups.

## Affected Products

- jeecgboot — JeecgBoot (0)

## References

- [CNA](https://github.com/AnkesKasty/cve-request-poc/blob/a7b6d1423555812d8efa26c91c5d0683164b31e5/JeecgBoot/poc_user_group_member_removal_batch.py)
- [CNA](https://github.com/jeecgboot/JeecgBoot/blob/e3b9dc0aefe1943d9772b026f64ed671a7c82802/jeecg-boot/jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/system/controller/SysUserController.java#L851-L866)
- [CNA](https://www.vulncheck.com/advisories/jeecgboot-through-3.9.5-missing-authorization-via-deleteusergroupbatch-endpoint)

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-10-11._