CVE-2026-58054

MyBB 1.8.40 does not restrict which usergroup a limited Admin Control Panel user may assign when creating or editing users; the user module offers the Administrators group gid 4 and its datahandler's verifyusergroup unconditionally returns true. An admin holding only the delegated user-management...

CVE-2026-58054

MyBB 1.8.40 is affected: the limited Admin Control Panel user management can assign the Administrators group (gid 4) because verify_usergroup() unconditionally returns true. This enables escalation from delegated user-management to full Administrator permissions. The issue comes from the user mod...

EUVD-2026-39974

MyBB 1.8.40 does not restrict which usergroup a limited Admin Control Panel user may assign when creating or editing users; the user module offers the Administrators group gid 4 and its datahandler's verifyusergroup unconditionally returns true. An admin holding only the delegated user-management...

PT-2026-53086

Name of the Vulnerable Software and Affected Versions MyBB version 1.8.40 Description An issue exists where users with limited Admin Control Panel ACP access can assign any usergroup to an account during creation or editing. This occurs because the verify usergroup function in the user module...