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-1138B39E-6ABB-11E9-A685-001B217B3468:
Gitlab reports:
Moving an Issue to Private Repo Leaks Project Namespace
Notification Emails Sent to Restricted Users
Unauthorized Comments on Confidential Issues
Merge Request Approval Count Inflation
Unsanitized Branch Names on New Merge Request Notification Emails
Improper Sanitation of Credentials in Gitaly
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