CVE-2018-21253 : Security Advisory and Response

A vulnerability in Mattermost Server versions prior to 5.1, 5.0.2, and 4.10.2 allows unauthorized users to be invited using the "invite_people" slash command.

Understanding CVE-2018-21253

This CVE identifies a security issue in Mattermost Server versions before 5.1, 5.0.2, and 4.10.2.

What is CVE-2018-21253?

This vulnerability enables attackers to invite non-permitted users through the "invite_people" slash command.

The Impact of CVE-2018-21253

Unauthorized users can gain access to the system, potentially leading to data breaches or unauthorized activities.

Technical Details of CVE-2018-21253

This section provides technical insights into the vulnerability.

Vulnerability Description

The flaw in Mattermost Server versions prior to 5.1, 5.0.2, and 4.10.2 allows unauthorized user invitations via the "invite_people" command.

Affected Systems and Versions

Mattermost Server versions before 5.1, 5.0.2, and 4.10.2

Exploitation Mechanism

Unauthorized users exploit the vulnerability by utilizing the "invite_people" slash command.

Mitigation and Prevention

Protect your systems from CVE-2018-21253 with the following measures.

Immediate Steps to Take

Update Mattermost Server to versions 5.1, 5.0.2, or 4.10.2 to mitigate the vulnerability.
Monitor user invitations and access to detect unauthorized activities.

Long-Term Security Practices

Regularly review and update access control policies.
Educate users on secure practices to prevent unauthorized access.

Patching and Updates

Stay informed about security updates from Mattermost and apply patches promptly to address vulnerabilities.