CVE-2021-21370 : What You Need to Know
Discover how CVE-2021-21370 exposes TYPO3.CMS to cross-site scripting. Learn the impacts, affected versions, and mitigation strategies for this medium severity vulnerability.
A cross-site scripting vulnerability has been discovered in TYPO3.CMS versions 7.0.0 to 11.1.0 where content elements of type menu are susceptible to XSS attacks when previewed in the page module. This CVE has a CVSS base score of 5.4, indicating a medium severity issue.
Understanding CVE-2021-21370
This section provides insights into the nature and impact of the cross-site scripting vulnerability in TYPO3.CMS.
What is CVE-2021-21370?
TYPO3.CMS, an open-source PHP-based web content management system, is affected by a cross-site scripting vulnerability in its content preview feature for menu content elements.
The Impact of CVE-2021-21370
The vulnerability allows attackers to execute malicious scripts in the context of an authenticated backend user, potentially leading to unauthorized actions or data theft.
Technical Details of CVE-2021-21370
Delve into the technical aspects of the CVE, including the vulnerability description, affected systems, versions, and exploitation mechanism.
Vulnerability Description
Content elements of type menu in TYPO3.CMS versions 7.0.0 to 11.1.0 are prone to cross-site scripting when their referenced items are previewed in the page module.
Affected Systems and Versions
The vulnerability affects TYPO3.CMS versions 7.0.0 to 11.1.0, including versions 7.6.50, 8.7.39, 9.5.24, 10.4.13, and 11.1.0.
Exploitation Mechanism
Successful exploitation of this vulnerability requires a valid backend user account to preview the referenced items in the page module.
Mitigation and Prevention
Explore the necessary steps to mitigate and prevent the exploitation of CVE-2021-21370.
Immediate Steps to Take
Users are advised to update their TYPO3.CMS installations to versions 7.6.51, 8.7.40, 9.5.25, 10.4.14, or 11.1.1 to address the vulnerability.
Long-Term Security Practices
Implement secure coding practices, perform regular security audits, and educate users on identifying and reporting security threats to enhance overall cybersecurity posture.
Patching and Updates
Stay informed about security advisories and promptly apply patches released by TYPO3 to address known vulnerabilities in the CMS.