CVE-2026-41259
Mastodon: Insufficient verification of email addresses
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-841 |
| Vendor | mastodon |
| Product | mastodon |
| Published | Apr 23, 2026 |
| Last Updated | Apr 23, 2026 |
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Affected Versions
mastodon / mastodon
< 4.3.22 >= 4.4.0-beta.1, < 4.4.16 >= 4.5.0-beta.1, < 4.5.9