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-66D1C277-652A-11EB-BB3F-001B217B3468:
Gitlab reports:
Stored XSS in merge request
Stored XSS in epic's pages
Sensitive GraphQL variables exposed in structured log
Guest user can see tag names in private projects
Information disclosure via error message
DNS rebinding protection bypass
Validate existence of private project
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