The vulnerability stems from inadequate secret detection during configuration export. Key evidence from the commit diff shows: 1) The Attribute.describe method was enhanced to add sensitive-data masking by inspecting field types/getters (added in _describe()), indicating prior lack of proper secret detection. 2) PrimitiveConfigurator was modified to explicitly mark Secret instances as 'encrypted' in Scalar values, proving prior versions leaked encrypted values without proper labeling. The added test cases (ExportTest/SGECloudTest) explicitly validate() that secret fields/constructors are no longer exported in plaintext, confirming the pre-patch behavior was vulnerable.