Defect DE44878 Security Issue

Document ID : KB000129573
Last Modified Date : 15/03/2019
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Please, can you explain to me the detail of the defect DE44878 Security Issue Major Problem 15.5.1? 
Unfortunately, we cannot provide the detail of the security issue that was permanently fixed in 15.5.1 because it will expose the vulnerability of this issue to hackers in lower releases.