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CVE-2021-32671— XSS vulnerability with translator

Quick assessment

Affected
flarum core
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Flarum等都是Flarum(Flarum)社区的产品。Flarum是一套开源的论坛系统。discussions等都是开源的产品。discussions是一个应用软件。Python requests等都是Python(Python)基金会的产品。requests是一个针对人类的优雅而简单的HTTP库。 Flarum 存在安全漏洞，该漏洞源于Flarum的翻译系统允许在呈现时将字符串输入转换为HTML DOM节点。

CVSS 10.0 · Critical EPSS 39.74% · P99
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I. Basic Information for CVE-2021-32671

Vulnerability Information
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Vulnerability Title
XSS vulnerability with translator
Source: CVE Program / CVE List V5
Vulnerability Description
Flarum is a forum software for building communities. Flarum's translation system allowed for string inputs to be converted into HTML DOM nodes when rendered. This change was made after v0.1.0-beta.16 (our last beta before v1.0.0) and was not noticed or documented. This allowed for any user to type malicious HTML markup within certain user input fields and have this execute on client browsers. The example which led to the discovery of this vulnerability was in the forum search box. Entering faux-malicious HTML markup, such as <script>alert('test')</script> resulted in an alert box appearing on the forum. This attack could also be modified to perform AJAX requests on behalf of a user, possibly deleting discussions, modifying their settings or profile, or even modifying settings on the Admin panel if the attack was targetted towards a privileged user. All Flarum communities that run flarum v1.0.0 or v1.0.1 are impacted. The vulnerability has been fixed and published as flarum/core v1.0.2. All communities running Flarum v1.0 have to upgrade as soon as possible to v1.0.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
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
Flarum跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Flarum等都是Flarum(Flarum)社区的产品。Flarum是一套开源的论坛系统。discussions等都是开源的产品。discussions是一个应用软件。Python requests等都是Python(Python)基金会的产品。requests是一个针对人类的优雅而简单的HTTP库。 Flarum 存在安全漏洞，该漏洞源于Flarum的翻译系统允许在呈现时将字符串输入转换为HTML DOM节点。
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
flarum core >= 1.0.0, < 1.0.2 -

II. Public POCs for CVE-2021-32671

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III. Intelligence Information for CVE-2021-32671

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Patches & Fixes for CVE-2021-32671 (1)

Vendor Advisories for CVE-2021-32671 (1)

Other References for CVE-2021-32671 (1)

IV. Related Vulnerabilities

Same product: core
Same vendor: flarum
Same weakness: CWE-79

V. Comments for CVE-2021-32671

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