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CVE-2025-62175— Mastodon streaming API fails to disconnect disabled and suspended 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 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，该漏洞源于禁用或暂停用户账户时未断开流API连接，可能导致被禁用账户继续接收实时更新。

CVSS 4.3 · Medium EPSS 0.23% · P12
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I. Basic Information for CVE-2025-62175

Vulnerability Information
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Vulnerability Title
Mastodon streaming API fails to disconnect disabled and suspended users
Source: CVE Program / CVE List V5
Vulnerability Description
Mastodon is a free, open-source social network server based on ActivityPub. In versions before 4.4.6, 4.3.14, and 4.2.27, disabling or suspending a user account does not disconnect the account from the streaming API. This allows disabled or suspended accounts to continue receiving real-time updates through existing streaming connections and to establish new streaming connections, even though they cannot interact with other API endpoints. This undermines moderation actions, as administrators expect disabled or suspended accounts to be fully disconnected from the service. 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
对于放弃特权的检查不恰当
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，该漏洞源于禁用或暂停用户账户时未断开流API连接，可能导致被禁用账户继续接收实时更新。
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-2025-62175

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III. Intelligence Information for CVE-2025-62175

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Patches & Fixes for CVE-2025-62175 (1)

Vendor Advisories for CVE-2025-62175 (1)

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

CVE-2025-62176 4.3 MEDIUM Mastadon streaming server allows OAuth clients without the `read` scope to subscribe to pu
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-273

V. Comments for CVE-2025-62175

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