An issue was discovered in GitLab Community and Enterprise Edition through 12.2.1. Certain account actions needed improved authentication and session management.

An issue was discovered in GitLab Community and Enterprise Edition through 12.2.1. Under certain circumstances, CI pipelines could potentially be used in a denial of service attack.

An issue was discovered in GitLab Community and Enterprise Edition 8.6 through 12.2.1. Under very specific conditions, commit titles and team member comments could become viewable to users who did not have permission to access these.

An issue was discovered in GitLab Community and Enterprise Edition 7.12 through 12.2.1. The specified default branch name could be exposed to unauthorized users.

An issue was discovered in GitLab Community and Enterprise Edition through 12.2.1. Embedded images and media files in markdown could be pointed to an arbitrary server, which would reveal the IP address of clients requesting the file from that server.

An issue was discovered in GitLab Community and Enterprise Edition 8.x (starting in 8.9), 9.x, 10.x, and 11.x before 11.5.9, 11.6.x before 11.6.7, and 11.7.x before 11.7.2. It has Incorrect Access Control. Guest users are able to add reaction emojis on comments to which they have no visibility.

An issue was discovered in GitLab Community and Enterprise Edition before 11.5.8, 11.6.x before 11.6.6, and 11.7.x before 11.7.1. It has Incorrect Access Control (issue 3 of 3). When a project with visibility more permissive than the target group is imported, it will retain its prior visibility.

An issue was discovered in GitLab Community and Enterprise Edition 8.x, 9.x, 10.x, and 11.x before 11.5.8, 11.6.x before 11.6.6, and 11.7.x before 11.7.1. It has Incorrect Access Control. Users are able to comment on locked project issues.

An issue was discovered in GitLab Community and Enterprise Edition before 11.5.8, 11.6.x before 11.6.6, and 11.7.x before 11.7.1. It has Insufficient Visual Distinction of Homoglyphs Presented to a User. IDN homographs and RTLO characters are rendered to unicode, which could be used for social engineering.

An issue was discovered in GitLab Community and Enterprise Edition before 11.5.8, 11.6.x before 11.6.6, and 11.7.x before 11.7.1. It allows Information Disclosure (issue 5 of 6). A project guest user can view the last commit status of the default branch.

An issue was discovered in GitLab Community and Enterprise Edition before 11.5.8, 11.6.x before 11.6.6, and 11.7.x before 11.7.1. It allows Path Disclosure. When an error is encountered on project import, the error message will display instance internal information.

An issue was discovered in GitLab Community and Enterprise Edition before 11.5.8, 11.6.x before 11.6.6, and 11.7.x before 11.7.1. It allows Information Disclosure (issue 4 of 6). In some cases, users without project permissions will receive emails after a project move. For private projects, this will disclose the new project namespace to an unauthorized user.

An issue was discovered in GitLab Community and Enterprise Edition before 11.5.8, 11.6.x before 11.6.6, and 11.7.x before 11.7.1. It allows Information Disclosure (issue 3 of 6). For installations using GitHub or Bitbucket OAuth integrations, it is possible to use a covert redirect to obtain the user OAuth token for those services.

An issue was discovered in GitLab Community and Enterprise Edition before 11.5.8, 11.6.x before 11.6.6, and 11.7.x before 11.7.1. It allows Denial of Service. Inputting an overly long string into a Markdown field could cause a denial of service.

An issue was discovered in GitLab Community and Enterprise Edition before 11.5.8, 11.6.x before 11.6.6, and 11.7.x before 11.7.1. It allows XSS (issue 1 of 2). Markdown fields contain a lack of input validation and output encoding when processing KaTeX that results in a persistent XSS.

An issue was discovered in GitLab Community and Enterprise Edition before 11.8.9. It has Incorrect Access Control. Unprivileged members of a project are able to post comments on confidential issues through an authorization issue in the note endpoint.

An issue was discovered in GitLab Community and Enterprise Edition before 11.8.9, 11.9.x before 11.9.10, and 11.10.x before 11.10.2. It has Improper Encoding or Escaping of Output. The branch name on new merge request notification emails isn't escaped, which could potentially lead to XSS issues.

An issue was discovered in GitLab Community and Enterprise Edition before 11.8.9, 11.9.x before 11.9.10, and 11.10.x before 11.10.2. It has a Race Condition which could allow users to approve a merge request multiple times and potentially reach the approval count required to merge.

An issue was discovered in GitLab Community and Enterprise Edition 8.x, 9.x, 10.x, and 11.x before 11.8.9, 11.9.x before 11.9.10, and 11.10.x before 11.10.2. It allows Information Disclosure. Non-member users who subscribe to notifications of an internal project with issue and repository restrictions will receive emails about restricted events.

GitLab CE/EE, versions 8.0 up to 11.x before 11.3.11, 11.4 before 11.4.8, and 11.5 before 11.5.1, would log access tokens in the Workhorse logs, permitting administrators with access to the logs to see another user's token.