CVE-2021-43991: Persistent XSS via Avatar Upload in Kentico Xperience CMS
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2021-43991?
CVE-2021-43991 has been classified with a moderate severity level due to its potential impact on user data.
What versions of Kentico Xperience are affected by CVE-2021-43991?
CVE-2021-43991 affects Kentico Xperience versions from 13.0.0 up to 13.0.43.
How do I fix CVE-2021-43991?
To fix CVE-2021-43991, upgrade to a version of Kentico Xperience that is higher than 13.0.43.
What type of vulnerability is CVE-2021-43991?
CVE-2021-43991 is a persistent Cross-Site Scripting (XSS) vulnerability.
What impact does CVE-2021-43991 have on users?
CVE-2021-43991 can potentially allow attackers to execute malicious scripts in the context of a user's session.