The analysis of the provided information, particularly the proof-of-concept and the patch, led to the identification of the vulnerable function. The PoC pointed to a SQL injection vulnerability in the moonshine-tree-resource component, triggered by a POST request to a /sortable endpoint. The commit 4fa8ce1925ed692ee89f06c1ce39a7e1d5f7af47 in the lee-to/moonshine-tree-resource repository, which corresponds to the patched version 2.0.2, contains the fix. The diff in routes/tree.php clearly shows the removal of the code that constructs and executes a raw SQL query using user-provided data. The vulnerable function is the closure that handles this request, as it directly processes the malicious input and constructs the vulnerable SQL query.