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CVE-2025-67500— Mastodon Error Handling Discrepancy Enables Private Status Existence Enumeration

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，该漏洞源于错误处理不一致，可能导致状态存在性泄露。以下版本受到影响：4.2.27及之前版本、4.3.0-beta.1版本至4.3.14版本、4.4.0-beta.1版本至4.4.9版本和4.5.0-beta.1版本至4.5.2版本。

CVSS 3.7 · Low EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1014 · Rootkit
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I. Basic Information for CVE-2025-67500

Vulnerability Information
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Vulnerability Title
Mastodon Error Handling Discrepancy Enables Private Status Existence Enumeration
Source: CVE Program / CVE List V5
Vulnerability Description
Mastodon is a free, open-source social network server based on ActivityPub. Versions 4.2.27 and prior, 4.3.0-beta.1 through 4.3.14, 4.4.0-beta.1 through 4.4.9, 4.5.0-beta.1 through 4.5.2 have discrepancies in error handling which allow checking whether a given status exists by sending a request with a non-English Accept-Language header. Using this behavior, an attacker who knows the identifier of a particular status they are not allowed to see can confirm whether this status exists or not. This cannot be used to learn the contents of the status or any other property besides its existence. This issue is fixed in versions 4.2.28, 4.3.15, 4.4.10 and 4.5.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
响应差异性信息暴露
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，该漏洞源于错误处理不一致，可能导致状态存在性泄露。以下版本受到影响：4.2.27及之前版本、4.3.0-beta.1版本至4.3.14版本、4.4.0-beta.1版本至4.4.9版本和4.5.0-beta.1版本至4.5.2版本。
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 < 4.2.28 -

II. Public POCs for CVE-2025-67500

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III. Intelligence Information for CVE-2025-67500

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Patches & Fixes for CVE-2025-67500 (1)

Vendor Advisories for CVE-2025-67500 (1)

IV. Related Vulnerabilities

Same product: mastodon
Same vendor: mastodon
Same weakness: CWE-204

V. Comments for CVE-2025-67500

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