Mastodon security update

Yesterday, the following not-so-subtle notice appeared on the admin interface of all Mastodon instances:

The Mastodon team announced on Monday that this release was coming, so we were ready for it:

Details of the vulnerability are still limited, but from what we do know it sounds serious (“Remote account takeover“).

All our managed Mastodon instances were safely patched just over an hour after the new packages dropped. One instance gave us a bit of trouble, as the new version appeared to tickle a bug in Elasticsearch causing ES to consume all CPU on the server. After we eventually pinned down the cause, it was resolved by an upgrade of Elasticsearch. Turns out the ES upgrade didn’t fix it, and we’re still working with our customer to get this resolved.

Managed open source hosting

Open source software such as Mastodon, GitLab and Nextcloud can offer a great alternative to the lock-in associated with proprietary cloud equivalents, but the effort associated with hosting them can be significant: backups, monitoring, security patching, and the investigation and debugging required when a supposedly innocuous software upgrade leaves your CPU usage wedged at 100%.

Our managed open source hosting provides the best of both worlds: the convenience of a “cloud” solution, but without the lock-in. Your data is yours, and if you don’t like our service you can take your data and host it somewhere else (although we’re confident you won’t want to). And because there’s no lock-in, you get straightforward pricing based on the resources you’re using, rather than loss-leaders followed by price hikes once you’re hooked.

Read more about our managed hosting, or drop us an email at for more information.