CVE-2021-20808 : Security Advisory and Response

A cross-site scripting vulnerability in the Search screen of Movable Type allows remote attackers to inject arbitrary script or HTML, affecting multiple versions.

Understanding CVE-2021-20808

This CVE identifies a cross-site scripting vulnerability in Movable Type that could be exploited by remote attackers using unspecified vectors.

What is CVE-2021-20808?

The CVE-2021-20808 is a cross-site scripting vulnerability in the Search screen of Movable Type, allowing attackers to inject malicious script or HTML content.

The Impact of CVE-2021-20808

This vulnerability can enable remote attackers to execute arbitrary script code or HTML on affected systems, potentially compromising user data and system integrity.

Technical Details of CVE-2021-20808

The technical details of this CVE include:

Vulnerability Description

The vulnerability resides in the Search screen of Movable Type, affecting versions Movable Type 7 r.4903 and earlier, Movable Type 6.8.0 and earlier, and others in the series.

Affected Systems and Versions

The affected systems include Movable Type 7 Series, Movable Type 6 Series, Movable Type Advanced 7 Series, Movable Type Premium, and Movable Type Premium Advanced.

Exploitation Mechanism

Remote attackers can exploit this vulnerability through unspecified vectors, injecting malicious script or HTML.

Mitigation and Prevention

To secure your systems from CVE-2021-20808, consider the following:

Immediate Steps to Take

Update Movable Type to the latest patched version.
Implement input validation mechanisms to sanitize user inputs.
Monitor and restrict server-side scripts that can be executed.

Long-Term Security Practices

Regularly audit and review security configurations.
Educate personnel on secure coding practices and threat awareness.

Patching and Updates

Stay informed about security patches and updates from the vendor, and apply them promptly to mitigate the risk of exploitation.