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-4EA507D1-9DA8-11E9-A759-001B217B3468:
Gitlab reports:
Ability to Write a Note to a Private Snippet
Recent Pipeline Information Disclosed to Unauthorised Users
Resource Exhaustion Attack
Error Caused by Encoded Characters in Comments
Authorization Issues in GraphQL
Number of Merge Requests was Accessible
Enabling One of the Service Templates Could Cause Resource Depletion
Broken Access Control for the Content of Personal Snippets
Decoding Color Codes Caused Resource Depletion
Merge Request Template Name Disclosure
SSRF Vulnerability in Project GitHub Integration
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