Vulnerability · Published Oct 10, 2026 · Assigned by VulnCheck

CVE-2026-108638JeecgBoot through 3.9.5 Missing Authorization via /sys/user/deleteGroupUser

Medium 4.3

In plain English

A medium-severity missing authorization in JeecgBoot from jeecgboot. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.2%top 85.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

JeecgBoot through 3.9.5 contains a missing authorization vulnerability that allows low-privileged authenticated users to remove group memberships via the deleteGroupUser handler in SysUserController. Attackers can send DELETE requests with arbitrary groupId and userId values to remove any user from any administrator-maintained user group without ownership or tenant checks.

Affected products (as reported)

Vendor	Product	Versions
jeecgboot	JeecgBoot	0 – through 3.9.5

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References

Researcher Proof of Concept exploit
Vulnerable Code (v3.9.5) technical-description
VulnCheck Advisory: JeecgBoot through 3.9.5 Missing Authorization via /sys/user/deleteGroupUser third-party-advisory