Summary #

Content-Security-Policy-Report-Only cannot be declared without report-uri directive, because of that it will send the violations to the defined URL.

Content-Security-Policy-Report-Only: script-src 'self'; report-uri https://www.example.com;

 

Actions To Take #
  • If you want to use one of the CSP in report only mode, you should declare with a report-uri

Classifications #
CWE-16, ISO27001-A.14.2.5, WASC-15, OWASP 2013-A5, OWASP 2017-A6
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