Security Advisory

CVE-2026-41259

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-04-23 18:55:20

Last updated 2026-04-23 19:24:15

Assigner GitHub_M

CVSS score 8.2

State PUBLISHED

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.

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