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CVE-2021-41095— XSS via blocked watched word in error message

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 Discourse 存在跨站点脚本 (XSS) 漏洞。该漏洞存在于 分支的 2.7.7 及更早版本、 分支的 2.8.0.beta6 及更早版本以及 2.8.0.beta6 及更早版本中。

CVSS 4.2 · Medium EPSS 0.58% · P45
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I. Basic Information for CVE-2021-41095

Vulnerability Information
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Vulnerability Title
XSS via blocked watched word in error message
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open source discussion platform. There is a cross-site scripting (XSS) vulnerability in versions 2.7.7 and earlier of the `stable` branch, versions 2.8.0.beta6 and earlier of the `beta` branch, and versions 2.8.0.beta6 and earlier of the `tests-passed` branch. Rendering of some error messages that contain user input can be susceptible to XSS attacks. This vulnerability only affects sites which have blocked watched words that contain HTML tags, modified or disabled Discourse's default Content Security Policy. This issue is patched in the latest `stable`, `beta` and `tests-passed` versions of Discourse. As a workaround, avoid modifying or disabling Discourse’s default Content Security Policy, and blocking watched words containing HTML tags.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/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 Discourse 存在跨站点脚本 (XSS) 漏洞。该漏洞存在于`stable` 分支的 2.7.7 及更早版本、`beta` 分支的 2.8.0.beta6 及更早版本以及 2.8.0.beta6 及更早版本中。
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 <= 2.7.7 -

II. Public POCs for CVE-2021-41095

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III. Intelligence Information for CVE-2021-41095

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Patches & Fixes for CVE-2021-41095 (1)

Vendor Advisories for CVE-2021-41095 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2021-41095

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