An issue was discovered in halo V1.1.3. A Zip Slip Directory Traversal Vulnerability in the backend,the attacker can overwrite some files, such as ftl files, .bashrc files in the user directory, and finally get the permissions of the operating system.
A Server-Side Freemarker template injection vulnerability in halo CMS v1.1.3 In the Edit Theme File function. The ftl file can be edited. This is the Freemarker template file. This file can cause arbitrary code execution when it is rendered in the background. exp: <#assign test="freemarker.template.utility.Execute"?new()> ${test("touch /tmp/freemarkerPwned")}
Halo blog 1.2.0 allows users to submit comments on blog posts via /api/content/posts/comments. The javascript code supplied by the attacker will then execute in the victim user's browser.
Halo before 1.2.0-beta.1 allows Server Side Template Injection (SSTI) because TemplateClassResolver.SAFER_RESOLVER is not used in the FreeMarker configuration.