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CVE-2025-27399— Mastodon's domain blocks & rationales ignore user approval when visibility set as "users"

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存在授权问题漏洞，该漏洞源于未批准用户可查看域阻止原因，影响不希望公开域阻止的实例管理员。

CVSS 5.3 · Medium EPSS 0.34% · P28

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2025-27399

Vulnerability Information
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Vulnerability Title
Mastodon's domain blocks & rationales ignore user approval when visibility set as "users"
Source: CVE Program / CVE List V5
Vulnerability Description
Mastodon is a self-hosted, federated microblogging platform. In versions prior to 4.1.23, 4.2.16, and 4.3.4, when the visibility for domain blocks/reasons is set to "users" (localized English string: "To logged-in users"), users that are not yet approved can view the block reasons. Instance admins that do not want their domain blocks to be public are impacted. Versions 4.1.23, 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:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Mastodon 授权问题漏洞
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存在授权问题漏洞，该漏洞源于未批准用户可查看域阻止原因，影响不希望公开域阻止的实例管理员。
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 < 4.1.23 -

II. Public POCs for CVE-2025-27399

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III. Intelligence Information for CVE-2025-27399

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Patches & Fixes for CVE-2025-27399 (3)

Vendor Advisories for CVE-2025-27399 (1)

IV. Related Vulnerabilities

Same product: mastodon
Same vendor: mastodon
Same weakness: CWE-200

V. Comments for CVE-2025-27399

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