CVE-2021-24408 : Security Advisory and Response
Learn about CVE-2021-24408, a stored XSS vulnerability in Prismatic WordPress plugin allowing low-privileged users to execute malicious code. Take immediate action to secure your WordPress site.
A stored cross-site scripting (XSS) vulnerability was discovered in the Prismatic WordPress plugin before version 2.8, allowing users with low roles to inject malicious code.
Understanding CVE-2021-24408
This vulnerability in the Prismatic WordPress plugin enables users with the role of Contributor or higher to insert Cross-Site Scripting payloads via shortcode parameters.
What is CVE-2021-24408?
The Prismatic WordPress plugin before version 2.8 fails to properly sanitize or validate certain shortcode parameters, permitting users with roles as low as Contributor to insert malicious payloads that could lead to XSS attacks.
The Impact of CVE-2021-24408
Users with higher privileges, such as Editors, can exploit this vulnerability without requiring approval. Even if the blog restricts the unfiltered_html capability, these users can execute XSS attacks.
Technical Details of CVE-2021-24408
This section provides deeper insights into the vulnerability.
Vulnerability Description
The flaw in the Prismatic WordPress plugin allows users with low roles to include XSS payloads through shortcode parameters, posing a risk of unauthorized code execution.
Affected Systems and Versions
The vulnerability affects versions of the Prismatic plugin prior to 2.8.
Exploitation Mechanism
Attackers can leverage this vulnerability to inject malicious scripts by exploiting insufficient sanitization of shortcode parameters.
Mitigation and Prevention
To safeguard your system from CVE-2021-24408, consider the following steps:
Immediate Steps to Take
- Update the Prismatic plugin to version 2.8 or higher to mitigate the vulnerability.
- Monitor blog posts by low-privileged users for suspicious activities.
Long-Term Security Practices
- Implement role-based access control to limit the capabilities of low-privileged users.
- Regularly audit and review user permissions and capabilities.
Patching and Updates
Stay informed about security updates for the Prismatic plugin and promptly apply patches to protect your WordPress site from potential attacks.