A vulnerability, which was classified as critical, was found in thinkgem JeeSite up to 5.12.0. This affects an unknown part of the file modules/core/src/main/java/com/jeesite/common/ueditor/ActionEnter.java of the component UEditor Image Grabber. The manipulation of the argument Source leads to server-side request forgery. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The identifier of the patch is 1c5e49b0818037452148e0f8ff69ed04cb8fefdc. It is recommended to apply a patch to fix this issue.
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.