CVE-2021-25968 : Security Advisory and Response

OpenCMS versions 10.5.0 to 11.0.2 are impacted by a stored XSS vulnerability that enables low privileged users to insert malicious scripts into the Sitemap feature. Find out more about the impact, technical details, and mitigation steps below.

Understanding CVE-2021-25968

This section provides insights into the nature of the CVE and its implications.

What is CVE-2021-25968?

The CVE-2021-25968 is a stored cross-site scripting (XSS) vulnerability found in OpenCMS versions 10.5.0 to 11.0.2. It allows attackers with low privileges to store and execute malicious scripts through the vulnerable Sitemap functionality.

The Impact of CVE-2021-25968

The vulnerability poses a medium severity threat with a CVSS base score of 5.4. Attackers can manipulate the Sitemap feature to inject harmful scripts that get executed in a victim's browser when accessing the compromised page.

Technical Details of CVE-2021-25968

Explore the specifics of the vulnerability to better understand its implications and affected systems.

Vulnerability Description

The stored XSS vulnerability in OpenCMS versions 10.5.0 to 11.0.2 allows low privileged users to insert malicious scripts into the Sitemap feature, leading to script execution in a victim's browser.

Affected Systems and Versions

The vulnerability impacts OpenCMS versions from 10.5.0 to 11.0.2, allowing threat actors to exploit the Sitemap functionality.

Exploitation Mechanism

Attackers with low privileges can abuse the Sitemap feature to store and execute malicious scripts on vulnerable pages, putting users at risk of script-based attacks.

Mitigation and Prevention

Discover the necessary steps to address and prevent the CVE-2021-25968 vulnerability.

Immediate Steps to Take

It is crucial to update OpenCMS to version 12.0 to mitigate the risk of exploitation and prevent unauthorized script execution.

Long-Term Security Practices

Incorporate security best practices such as regular software updates, security training for users, and implementing secure coding practices to prevent XSS vulnerabilities.

Patching and Updates

Stay informed about security patches and updates provided by OpenCMS to address known vulnerabilities and enhance system security.