CVE-2021-21365 : What You Need to Know

Bootstrap Package is a theme for TYPO3 vulnerable to cross-site scripting in content rendering, affecting versions 7.1.0 to 11.0.3. This vulnerability requires a valid backend user account for exploitation. Users are advised to update to the patched versions to mitigate the risk.

Understanding CVE-2021-21365

This CVE involves a cross-site scripting vulnerability in Bootstrap Package for TYPO3, allowing attackers to execute malicious scripts in the website frontend.

What is CVE-2021-21365?

CVE-2021-21365 is a security vulnerability in Bootstrap Package that allows attackers to inject and execute malicious scripts in the frontend of TYPO3 websites, potentially compromising user data and site integrity.

The Impact of CVE-2021-21365

The impact of this vulnerability includes unauthorized access to user data, manipulation of website content, and potential site defacement, posing a risk to the overall security and integrity of affected websites.

Technical Details of CVE-2021-21365

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability in Bootstrap Package allows attackers to conduct cross-site scripting attacks, leading to the execution of arbitrary scripts in the website frontend.

Affected Systems and Versions

The affected versions of Bootstrap Package range from 7.1.0 to 11.0.3 in TYPO3 installations.

Exploitation Mechanism

To exploit this vulnerability, attackers need a valid backend user account to inject and execute malicious scripts through the rendered content in the website frontend.

Mitigation and Prevention

Protect your system from CVE-2021-21365 by following these security measures.

Immediate Steps to Take

Users are advised to update Bootstrap Package to versions 7.1.2, 8.0.8, 9.1.4, 10.0.10, or 11.0.3 to patch the vulnerability and prevent exploitation.

Long-Term Security Practices

Implement secure coding practices, regularly monitor and audit extensions, and restrict backend access to authorized personnel to enhance overall system security.

Patching and Updates

Stay informed about security advisories, regularly update TYPO3 extensions, and apply security patches promptly to protect against known vulnerabilities.