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-DDD48087-BD86-11E9-B13F-001B217B3468:
Gitlab reports:
Insecure Authentication Methods Disabled for Grafana By Default
Multiple Command-Line Flag Injection Vulnerabilities
Insecure Cookie Handling on GitLab Pages
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