Mastodon is a free, open-source social network server based on ActivityPub. Prior to versions 3.5.14, 4.0.10, 4.1.8, and 4.2.0-rc2, under certain circumstances, attackers can exploit a flaw in domain name normalization to spoof domains they do not own. Versions 3.5.14, 4.0.10, 4.1.8, and 4.2.0-rc2 contain a patch for this issue.
| Software | From | Fixed in |
|---|---|---|
| joinmastodon / mastodon | 4.2.0-beta1 | 4.2.0-beta1.x |
| joinmastodon / mastodon | 4.2.0-beta2 | 4.2.0-beta2.x |
| joinmastodon / mastodon | 4.2.0-beta3 | 4.2.0-beta3.x |
| joinmastodon / mastodon | 4.2.0-rc1 | 4.2.0-rc1.x |
| joinmastodon / mastodon | 4.1.0 | 4.1.8 |
| joinmastodon / mastodon | 4.0.0 | 4.0.10 |
| joinmastodon / mastodon | - | 3.5.14 |