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CVE-2023-42452— Mastodon vulnerable to Stored XSS through the translation feature

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 3.5.14之前、4.0.10之前、4.1.8之前、4.2.0-rc2之前版本存在跨站脚本漏洞，该漏洞源于某些情况下，攻击者可以滥用翻译功能来绕过服务器端 HTML 清理，从而允许未转义的 HTML 在浏览器中执行。

CVSS 6.1 · Medium EPSS 0.44% · P36
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I. Basic Information for CVE-2023-42452

Vulnerability Information
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Vulnerability Title
Mastodon vulnerable to Stored XSS through the translation feature
Source: CVE Program / CVE List V5
Vulnerability Description
Mastodon is a free, open-source social network server based on ActivityPub. In versions on the 4.x branch prior to versions 4.0.10, 4.2.8, and 4.2.0-rc2, under certain conditions, attackers can abuse the translation feature to bypass the server-side HTML sanitization, allowing unescaped HTML to execute in the browser. The impact is limited thanks to Mastodon's strict Content Security Policy, blocking inline scripts, etc. However a CSP bypass or loophole could be exploited to execute malicious XSS. Furthermore, it requires user interaction, as this can only occur upon clicking the “Translate” button on a malicious post. Versions 4.0.10, 4.2.8, and 4.2.0-rc2 contain a patch for this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Mastodon 跨站脚本漏洞
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 3.5.14之前、4.0.10之前、4.1.8之前、4.2.0-rc2之前版本存在跨站脚本漏洞，该漏洞源于某些情况下，攻击者可以滥用翻译功能来绕过服务器端 HTML 清理，从而允许未转义的 HTML 在浏览器中执行。
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 >= 4.0.0, < 4.0.10 -

II. Public POCs for CVE-2023-42452

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III. Intelligence Information for CVE-2023-42452

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Patches & Fixes for CVE-2023-42452 (1)

Vendor Advisories for CVE-2023-42452 (1)

Same Patch Batch · mastodon · 2023-09-19 · 3 CVEs total

CVE-2023-42451 7.4 HIGH Mastodon Invalid Domain Name Normalization vulnerability
CVE-2023-42450 5.4 MEDIUM Mastodon Server-Side Request Forgery vulnerability

IV. Related Vulnerabilities

Same product: mastodon
Same vendor: mastodon
Same weakness: CWE-79

V. Comments for CVE-2023-42452

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