Mattermost End of Life Dates

Developers rely on Mattermost, a communication platform, to collaborate and share information within their teams, and tracking its end-of-life dates is crucial for maintaining the security and stability of their systems. Mattermost was created to provide a self-hosted, open-source alternative to other communication tools, and its maintenance is overseen by its active community. The platform has been widely adopted due to its flexibility, customizability, and extensibility, making it a popular choice among development teams. With a total of 53 versions released, Mattermost has undergone significant evolution since its inception.

The end-of-life landscape for Mattermost is characterized by a large number of unsupported versions, with 49 out of 53 versions having reached their end-of-life. Currently, only four versions remain active, with the latest stable version being 10.11.20. The next version to expire is 11.5, which is scheduled to reach its end-of-life on 2026-06-15. This means that developers still using version 11.5 must plan their upgrades before this date to ensure continued support and security patches. The most recent version to reach its end-of-life was 11.4, which expired on 2026-05-15, emphasizing the need for developers to stay up-to-date with the latest versions.

The security picture for Mattermost appears to be favorable, with no recorded Common Vulnerabilities and Exposures (CVEs) tracked to date. This translates to zero critical CVEs, and as a result, there is no most affected version. With no known security vulnerabilities, developers can focus on upgrading to the latest versions to take advantage of new features and improvements. To maintain the security and integrity of their systems, developers should prioritize upgrading to the latest stable version, currently 10.11.20, and keep a close eye on upcoming end-of-life dates to ensure timely upgrades and avoid potential security risks.