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Security Policy

If you believe you've identified a security vulnerability in Mastodon (a bug that allows something to happen that shouldn't be possible), you can either:

You should not report such issues on public GitHub issues or in other public spaces to give us time to publish a fix for the issue without exposing Mastodon's users to increased risk.


A "vulnerability in Mastodon" is a vulnerability in the code distributed through our main source code repository on GitHub. Vulnerabilities that are specific to a given installation (e.g. misconfiguration) should be reported to the owner of that installation and not us.

Supported Versions

Version Supported
4.2.x Yes
4.1.x Yes
4.0.x Until 2023-10-31
3.5.x Until 2023-12-31
< 3.5 No