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CVE-2025-27157— Mastodon's rate-limits are missing on `/auth/setup`

Quick assessment

Affected
mastodon mastodon
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mastodon是Mastodon开源的一款基于ActivityPub的开源社交网络服务器。 Mastodon存在安全漏洞，该漏洞源于/auth/setup缺少速率限制，可能导致发送邮件到任意地址。

CVSS 5.3 · Medium EPSS 0.37% · P28

Possible ATT&CK Techniques 1 AI

T1534 · Internal Spearphishing
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I. Basic Information for CVE-2025-27157

Vulnerability Information
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Vulnerability Title
Mastodon's rate-limits are missing on `/auth/setup`
Source: CVE Program / CVE List V5
Vulnerability Description
Mastodon is a self-hosted, federated microblogging platform. Starting in version 4.2.0 and prior to versions 4.2.16 and 4.3.4, the rate limits are missing on `/auth/setup`. Without those rate limits, an attacker can craft requests that will send an email to an arbitrary addresses. Versions 4.2.16 and 4.3.4 fix the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Mastodon 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mastodon是Mastodon开源的一款基于ActivityPub的开源社交网络服务器。 Mastodon存在安全漏洞，该漏洞源于/auth/setup缺少速率限制，可能导致发送邮件到任意地址。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
mastodon mastodon >= 4.2.0, < 4.2.16 -

II. Public POCs for CVE-2025-27157

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III. Intelligence Information for CVE-2025-27157

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Patches & Fixes for CVE-2025-27157 (1)

Vendor Advisories for CVE-2025-27157 (1)

IV. Related Vulnerabilities

Same product: mastodon
Same vendor: mastodon
Same weakness: CWE-770

V. Comments for CVE-2025-27157

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