An information disclosure issue was discovered GitLab versions < 12.1.2, < 12.0.4, and < 11.11.6 in the security dashboard which could result in disclosure of vulnerability feedback information.

An IDOR vulnerability exists in GitLab <v12.1.2, <v12.0.4, and <v11.11.6 that allowed uploading files from project archive to replace other users files potentially allowing an attacker to replace project binaries or other uploaded assets.

An privilege escalation issue was discovered in Gitlab versions < 12.1.2, < 12.0.4, and < 11.11.6 when Mattermost slash commands are used with a blocked account.

An input validation and output encoding issue was discovered in the GitLab CE/EE wiki pages feature which could result in a persistent XSS. This vulnerability was addressed in 12.1.2, 12.0.4, and 11.11.6.

An IDOR was discovered in GitLab CE/EE 11.5 and later that allowed new merge requests endpoint to disclose label names.

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.

A flawed DNS rebinding protection issue was discovered in GitLab CE/EE 10.2 and later in the `url_blocker.rb` which could result in SSRF where the library is utilized.

An authorization issue was discovered in the GitLab CE/EE CI badge images endpoint which could result in disclosure of the build status. This vulnerability was addressed in 12.1.2, 12.0.4, and 11.11.6.

A privilege escalation issue was discovered in GitLab CE/EE 9.0 and later when trigger tokens are not rotated once ownership of them has changed.

An input validation problem was discovered in the GitHub service integration which could result in an attacker being able to make arbitrary POST requests in a GitLab instance's internal network. This vulnerability was addressed in 12.1.2, 12.0.4, and 11.11.6.

An issue was discovered in GitLab Community Edition (CE) and Enterprise Edition (EE) 8.13 through 12.6.1. It has Incorrect Access Control.

An issue was discovered in GitLab Community Edition (CE) and Enterprise Edition (EE) 9.1 through 12.6.1. It has Incorrect Access Control.

An issue was discovered in GitLab Community Edition (CE) and Enterprise Edition (EE) 11.0 through 12.6. It allows Uncontrolled Resource Consumption.

An issue was discovered in GitLab Community Edition (CE) and Enterprise Edition (EE) 11.4 through 12.6.1. It has Incorrect Access Control.

An issue was discovered in GitLab Community Edition (CE) and Enterprise Edition (EE) 10.8 through 12.6.1. It has Incorrect Access Control.

An issue was discovered in GitLab Community Edition (CE) and Enterprise Edition (EE) 12.6. It has Incorrect Access Control.

An issue was discovered in GitLab Community Edition (CE) and Enterprise Edition (EE) 12.3 through 12.6.1. It allows Denial of Service.

In GitLab EE 10.5 through 12.5.3, 12.4.5, and 12.3.8, when transferring a public project to a private group, private code would be disclosed via the Group Search API provided by the Elasticsearch integration.

In GitLab EE 11.3 through 12.5.3, 12.4.5, and 12.3.8, insufficient parameter sanitization for the Maven package registry could lead to privilege escalation and remote code execution vulnerabilities under certain conditions.

GitLab EE 8.4 through 12.5, 12.4.3, and 12.3.6 stored several tokens in plaintext.