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CVE-2024-37903— Mastodon has improper authorship check on audience extension for existing posts

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是一款基于ActivityPub的开源社交网络服务器。 Mastodon 2.6.0至4.1.18和4.2.10之前版本存在安全漏洞，该漏洞源于攻击者通过精心策划特定活动，将不属于他们自己的帖子的受众扩展到目标服务器上的其他用户，从而获得不属于他们帖子内容的访问权限。

CVSS 8.2 · High EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2024-37903

Vulnerability Information
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Vulnerability Title
Mastodon has improper authorship check on audience extension for existing posts
Source: CVE Program / CVE List V5
Vulnerability Description
Mastodon is a self-hosted, federated microblogging platform. Starting in version 2.6.0 and prior to versions 4.1.18 and 4.2.10, by crafting specific activities, an attacker can extend the audience of a post they do not own to other Mastodon users on a target server, thus gaining access to the contents of a post not intended for them. Versions 4.1.18 and 4.2.10 contain a patch for this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Mastodon 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mastodon是一款基于ActivityPub的开源社交网络服务器。 Mastodon 2.6.0至4.1.18和4.2.10之前版本存在安全漏洞，该漏洞源于攻击者通过精心策划特定活动，将不属于他们自己的帖子的受众扩展到目标服务器上的其他用户，从而获得不属于他们帖子内容的访问权限。
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 >= 2.6.0, < 4.1.18 -

II. Public POCs for CVE-2024-37903

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III. Intelligence Information for CVE-2024-37903

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Patches & Fixes for CVE-2024-37903 (2)

Vendor Advisories for CVE-2024-37903 (1)

Other References for CVE-2024-37903 (2)

IV. Related Vulnerabilities

Same product: mastodon
Same vendor: mastodon
Same weakness: CWE-862

V. Comments for CVE-2024-37903

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