Improper authorization vulnerability in SnippetRPCServiceImpl allowing user's to comment on snippets they are not authorised to access - CVE-2017-18095

The SnippetRPCServiceImpl class in Atlassian Crucible before version 4.5.1 (the fixed version 4.5.x) and before 4.6.0 allows remote attackers to comment on snippets they do not have authorization to access via an improper authorization vulnerability.