CVE-2025-54879— Mastodon e‑mail throttle misconfiguration allows unlimited email confirmations against unconfirmed emails

Mastodon e‑mail throttle misconfiguration allows unlimited email confirmations against unconfirmed emails

Mastodon is a free, open-source social network server based on ActivityPub Mastodon which facilitates LDAP configuration for authentication. In versions 3.1.5 through 4.2.24, 4.3.0 through 4.3.11 and 4.4.0 through 4.4.3, Mastodon's rate-limiting system has a critical configuration error where the email-based throttle for confirmation emails incorrectly checks the password reset path instead of the confirmation path, effectively disabling per-email limits for confirmation requests. This allows attackers to bypass rate limits by rotating IP addresses and send unlimited confirmation emails to any email address, as only a weak IP-based throttle (25 requests per 5 minutes) remains active. The vulnerability enables denial-of-service attacks that can overwhelm mail queues and facilitate user harassment through confirmation email spam. This is fixed in versions 4.2.24, 4.3.11 and 4.4.3.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

不加限制或调节的资源分配

Mastodon 安全漏洞

Mastodon是Mastodon开源的一款基于ActivityPub的开源社交网络服务器。 Mastodon 4.2.24及之前版本、4.3.11及之前版本和4.4.3及之前版本存在安全漏洞，该漏洞源于速率限制配置错误，可能导致拒绝服务攻击。

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