Before Beetl v3.15.12, the rendering template has a server-side template injection (SSTI) vulnerability. When the incoming template is controllable, it will be filtered by the DefaultNativeSecurityManager blacklist. Because blacklist filtering is not strict, the blacklist can be bypassed, leading to arbitrary code execution.
A vulnerability was found in xiandafu beetl-bbs. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the file WebUtils.java. The manipulation of the argument user leads to cross site scripting. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The associated identifier of this vulnerability is VDB-215107.