An issue was discovered in GitLab Community and Enterprise Edition 8.13 through 11.11. Non-member users who subscribed to issue notifications could access the title of confidential issues through the unsubscription page. It allows Information Disclosure.
An information disclosure issue was discovered in GitLab CE/EE 8.14 and later, by using the move issue feature which could result in disclosure of the newly created issue ID.
An issue was discovered in GitLab Enterprise Edition (EE) 8.9.0 through 12.6.1. Using the project import feature, it was possible for someone to obtain issues from private projects.