Merges multiple .nessus XML files into one file. The resulting file can be imported into Nessus again to genereate a single report.

Note: The files are added together, which will result in duplicates if the same asset is included in both files.

NessusReportMerger.ps1

Runs with default variables for -filepath, -outputfilename and -reportname. Merges the files in the current folder to the file "merged_nessus_report.nessus" and sets the report name to "Merged Report".

NessusReportMerger.ps1 -filepath "C:\foo"

Runs with default variables for -outputfilename and -reportname. Merges the files in "C:\foo" to the file "merged_nessus_report.nessus" and sets the report name to "Merged Report".

NessusReportMerger.ps1 -reportname "FooReport"

Runs with default variables for -filepath and -outputfilename. Merges the files in the current folder to the file "merged_nessus_report.nessus" and sets the report name to "FooReport".

NessusReportMerger.ps1 -filepath "C:\foo" -outputfilename "FooReport.nessus" -reportname "FooReport"

Merges the files in the "C:\foo" folder to the file "FooReport.nessus" and sets the report name to "FooReport".

https://gist.github.com/mastahyeti/2720173 by Ben Toews

https://www.darkoperator.com/blog/2015/2/16/merging-nessus-xml-reports-with-powershell by Carlos Perez