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.

INFO

Published Date :

2026-04-23T18:55:20.854Z

Last Modified :

2026-04-23T19:24:15.567Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-41259 vulnerability.

No data.

REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-41259.

URL Resource
https://github.com/mastodon/mastodon/security/advisories/GHSA-5r37-qpwq-2jhh cve-icon cve-icon
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CVSS Vulnerability Scoring System

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Privileges Required
User Interaction
VS Confidentiality
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SS Confidentiality
SS Integrity
SS Availability