| Package | Affected versions | Patched versions |
|---|---|---|
| mastodon | ≥ 4.4.0, < 4.4.16≥ 4.5.0, < 4.5.9< 4.3.22 | 4.4.164.5.94.3.22 |
Mastodon is a free, open-source social network server based on ActivityPub. Prior to v4.5.9, v4.4.16, and v4.3.22, Mastodon allows restricting new user sign-up based on e-mail domain names, and performs basic validation on e-mail addresses, but fails to restrict characters that are interpreted differently by some mailing servers. This vulnerability is fixed in v4.5.9, v4.4.16, and v4.3.22.
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