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4.4

Weaver Show Posts plugin for WordPress: Malicious scripts can be injected into pages

CVE-2026-2121
Summary

The Weaver Show Posts plugin for WordPress has a security flaw that allows attackers with Administrator-level access to inject malicious scripts into pages. This can happen when an administrator adds a class to a post. If you use this plugin, update to the latest version or remove it to prevent potential security risks.

Original title
The Weaver Show Posts plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'add_class' parameter in all versions up to, and including, 1.8.1. This is due to insufficient input ...
Original description
The Weaver Show Posts plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'add_class' parameter in all versions up to, and including, 1.8.1. This is due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This primarily affects multisite installations where Administrators do not have the unfiltered_html capability.
nvd CVSS3.1 4.4
Vulnerability type
CWE-79 Cross-site Scripting (XSS)
Published: 21 Mar 2026 · Updated: 21 Mar 2026 · First seen: 21 Mar 2026