CVE-2019-20886 Explained : Impact and Mitigation

A problem was found in Mattermost Server version 5.8.0 and earlier, where the initial user occasionally becomes a system administrator by mistake.

Understanding CVE-2019-20886

An issue was discovered in Mattermost Server before 5.8.0. The first user is sometimes inadvertently a system admin.

What is CVE-2019-20886?

CVE-2019-20886 is a vulnerability in Mattermost Server versions prior to 5.8.0, allowing the initial user to unintentionally gain system administrator privileges.

The Impact of CVE-2019-20886

This vulnerability could lead to unauthorized access and potential misuse of system administrator capabilities by regular users.

Technical Details of CVE-2019-20886

Vulnerability Description

The flaw in Mattermost Server versions before 5.8.0 enables the initial user to be mistakenly assigned system administrator privileges.

Affected Systems and Versions

Product: Mattermost Server
Versions affected: 5.8.0 and earlier

Exploitation Mechanism

The vulnerability occurs during the user setup process, where the initial user is incorrectly granted system administrator rights.

Mitigation and Prevention

Immediate Steps to Take

Upgrade Mattermost Server to version 5.8.0 or later to mitigate the vulnerability.
Regularly review and adjust user permissions to prevent unauthorized access.

Long-Term Security Practices

Implement least privilege access controls to limit user permissions.
Conduct regular security audits and testing to identify and address potential vulnerabilities.

Patching and Updates

Apply security patches and updates promptly to ensure that known vulnerabilities are addressed and system security is maintained.