Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
From VID-4CB49A23-6C89-11E8-8B33-E8E0B747A45A:
Google Chrome Releases reports:
1 security fix contributed by external researchers:
[845961] High CVE-2018-6148: Incorrect handling of CSP header. Reported by Michal Bentkowski on 2018-05-23
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