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CVE-2025-62176— Mastadon streaming server allows OAuth clients without the `read` scope to subscribe to public channels

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 4.4.6之前版本、4.3.14之前版本和4.2.27之前版本存在安全漏洞，该漏洞源于流服务器接受使用任何有效身份验证令牌为公共时间线提供服务的事件，可能导致意外访问公共帖子。

CVSS 4.3 · Medium EPSS 0.27% · P17

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2025-62176

Vulnerability Information
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Vulnerability Title
Mastadon streaming server allows OAuth clients without the `read` scope to subscribe to public channels
Source: CVE Program / CVE List V5
Vulnerability Description
Mastodon is a free, open-source social network server based on ActivityPub. In Mastodon before 4.4.6, 4.3.14, and 4.2.27, the streaming server accepts serving events for public timelines to clients using any valid authentication token, even if those tokens lack the read:statuses scope. This allows OAuth clients without the read scope to subscribe to public channels and receive public timeline events. The impact is limited, as this only affects new public posts published on the public timelines and requires an otherwise valid token, but this may lead to unexpected access to public posts in a limited-federation setting. This issue has been patched in versions 4.4.6, 4.3.14, and 4.2.27. No known workarounds exist.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不充分权限或特权的处理不恰当
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 4.4.6之前版本、4.3.14之前版本和4.2.27之前版本存在安全漏洞，该漏洞源于流服务器接受使用任何有效身份验证令牌为公共时间线提供服务的事件，可能导致意外访问公共帖子。
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 >= 4.4.0-beta.1, < 4.4.6 -

II. Public POCs for CVE-2025-62176

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III. Intelligence Information for CVE-2025-62176

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Patches & Fixes for CVE-2025-62176 (1)

Vendor Advisories for CVE-2025-62176 (1)

Same Patch Batch · mastodon · 2025-10-13 · 3 CVEs total

CVE-2025-62175 4.3 MEDIUM Mastodon streaming API fails to disconnect disabled and suspended users
CVE-2025-62174 3.5 LOW Mastodon allows continued access after password reset via CLI

IV. Related Vulnerabilities

Same product: mastodon
Same vendor: mastodon
Same weakness: CWE-280

V. Comments for CVE-2025-62176

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