CVE ID :CVE-2026-41259 Published : April 23, 2026, 7:17 p.m. | 27 minutes ago Description :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. Severity: 8.2 | HIGH Visit the link for more details, such as CVSS details, affected products, timeline, and more...