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Miggo AIRoot Cause AnalysisThe analysis is based on the explicit description of the vulnerability, which clearly identifies 'handle_form_submission' as the function responsible for deserializing untrusted input, leading to PHP Object Injection. The provided reference URLs, specifically those pointing to app/API/Actions/Frontend/FormAction.php at line 59 in both vulnerable (tags/1.21.0) and potentially patched (trunk) versions, corroborate the location of this function. Although direct access to the patch diffs from the Trac changeset URLs was not possible due to HTTP 403 errors, the detailed vulnerability description and file references provide sufficient information to confidently identify this function as the primary vulnerable entry point. The vulnerability is triggered when this function processes malicious serialized data.
FormAction.handle_form_submissionapp/API/Actions/Frontend/FormAction.php