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CVE-2021-43991— Persistent XSS via Avatar Upload in Kentico Xperience CMS

Quick assessment

Affected
Kentico Kentico Xperience XMS
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.

Kentico是美国Kentico公司的一套基于ASP.NET的内容管理系统（CMS）。 Kentico Xperience CMS 存在安全漏洞，该漏洞源于Kentico Xperience CMS 13.0 13.0.43版本容易出现持久的跨站脚本(XSS)漏洞(也称为存储或二阶XSS)。攻击者可利用该漏洞执行客户端代码。

CVSS 6.8 · Medium EPSS 0.55% · P43
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I. Basic Information for CVE-2021-43991

Vulnerability Information
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Vulnerability Title
Persistent XSS via Avatar Upload in Kentico Xperience CMS
Source: CVE Program / CVE List V5
Vulnerability Description
The Kentico Xperience CMS version 13.0 – 13.0.43 is vulnerable to a persistent Cross-Site Scripting (XSS) vulnerability (also known as Stored or Second-Order XSS). Persistent XSS vulnerabilities occur when the application stores and retrieves client supplied data without proper handling of dangerous content. This type of XSS vulnerability is exploited by submitting malicious script content to the application which is then retrieved and executed by other application users. The attacker could exploit this to conduct a range of attacks against users of the affected application such as session hijacking, account take over and accessing sensitive data.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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
Kentico 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kentico是美国Kentico公司的一套基于ASP.NET的内容管理系统（CMS）。 Kentico Xperience CMS 存在安全漏洞，该漏洞源于Kentico Xperience CMS 13.0 13.0.43版本容易出现持久的跨站脚本(XSS)漏洞(也称为存储或二阶XSS)。攻击者可利用该漏洞执行客户端代码。
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
Kentico Kentico Xperience XMS 13.0 ~ 13.0.43 -

II. Public POCs for CVE-2021-43991

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III. Intelligence Information for CVE-2021-43991

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Other References for CVE-2021-43991 (1)

IV. Related Vulnerabilities

Same vendor: Kentico
Same weakness: CWE-79

V. Comments for CVE-2021-43991

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