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CVE-2021-37633— XSS via d-popover and d-html-popover attribute

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 2.7.8之前版本存在跨站脚本漏洞，该漏洞源于软件中的d-popover工具提示内容呈现很容易受到跨站脚本攻击。此漏洞仅影响已修改或禁用Discourse默认内容安全策略的站点。

CVSS 7.4 · High EPSS 0.76% · P53

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2021-37633

Vulnerability Information
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Vulnerability Title
XSS via d-popover and d-html-popover attribute
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open source discussion platform. In versions prior to 2.7.8 rendering of d-popover tooltips can be susceptible to XSS attacks. This vulnerability only affects sites which have modified or disabled Discourse's default Content Security Policy. This issue is patched in the latest `stable` 2.7.8 version of Discourse. As a workaround users may ensure that the Content Security Policy is enabled, and has not been modified in a way which would make it more vulnerable to XSS attacks.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/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 2.7.8之前版本存在跨站脚本漏洞，该漏洞源于软件中的d-popover工具提示内容呈现很容易受到跨站脚本攻击。此漏洞仅影响已修改或禁用Discourse默认内容安全策略的站点。
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 < 2.7.8 -

II. Public POCs for CVE-2021-37633

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III. Intelligence Information for CVE-2021-37633

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Patches & Fixes for CVE-2021-37633 (1)

Vendor Advisories for CVE-2021-37633 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2021-37633

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