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CVE-2023-30538— Stored Cross-site Scripting via improper sanitization of svg files in Discourse

Quick assessment

Affected
discourse discourse
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.

Discourse是一套开源的社区讨论平台。该平台包括社区、电子邮件和聊天室等功能。 Discourse存在跨站脚本漏洞，该漏洞源于允许攻击者上传 SVG 文件在用户的浏览器上执行任意 JavaScript代码。受影响的产品和版本：Discourse stable 3.0.2及之前版本，beta 3.1.0.beta3及之前版本，tests-passed 3.1.0.beta3及之前版本。

CVSS 5.4 · Medium EPSS 0.36% · P28
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I. Basic Information for CVE-2023-30538

Vulnerability Information
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Vulnerability Title
Stored Cross-site Scripting via improper sanitization of svg files in Discourse
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open source platform for community discussion. Due to the improper sanitization of SVG files, an attacker can execute arbitrary JavaScript on the users’ browsers by uploading a crafted SVG file. This issue is patched in the latest stable and tests-passed versions of Discourse. Users are advised to upgrade. For users unable to upgrade there are two possible workarounds: enable CDN handing of uploads (and ensure the CDN sanitizes SVG files) or disable SVG file uploads by ensuring that the `authorized extensions` site setting does not include `svg` (or reset that setting to the default, by default Discourse doesn't enable SVG uploads by users).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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
Discourse 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Discourse是一套开源的社区讨论平台。该平台包括社区、电子邮件和聊天室等功能。 Discourse存在跨站脚本漏洞，该漏洞源于允许攻击者上传 SVG 文件在用户的浏览器上执行任意 JavaScript代码。受影响的产品和版本：Discourse stable 3.0.2及之前版本，beta 3.1.0.beta3及之前版本，tests-passed 3.1.0.beta3及之前版本。
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
discourse discourse stable: < 3.0.3 -

II. Public POCs for CVE-2023-30538

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III. Intelligence Information for CVE-2023-30538

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Vendor Advisories for CVE-2023-30538 (1)

Same Patch Batch · discourse · 2023-04-18 · 4 CVEs total

CVE-2023-30606 4.2 MEDIUM Multisite denial of service through unsanitized dynamic dispatch to SiteSetting in Discour
CVE-2023-29196 4.2 MEDIUM HTML injection via topic embedding in Discourse
CVE-2023-28440 2.7 LOW Denial of service via admin theme import route in Discourse

IV. Related Vulnerabilities

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

V. Comments for CVE-2023-30538

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