CVE-2021-43991 MEDIUM

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

Vendor Kentico
Product Kentico Xperience XMS
Weakness CWE-79 · XSS
Published December 3, 2021
Last update August 4, 2024

CVSS base score

6.8/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

December 3, 2021 CVE published
August 4, 2024 Record updated