The primary vulnerability stems from owa_fileCache::putItemToCacheStore's improper header generation, which directly causes sensitive data exposure via unparsed PHP files. This is confirmed by the devel0pment.de analysis showing single-quote usage in cache headers. The secondary function owa_optionsUpdateController::action is implicated in the exploit chain by allowing settings changes that facilitate RCE, as documented in the vulnerability's technical breakdown. Both functions are explicitly tied to the described attack vectors.