What the vulnerability does
01Description
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.
Explanation of Vulnerability in Simple Terms
02Summary
Weaver Show Posts versions 1.8.1 and earlier contain a cross-site scripting (XSS) vulnerability that allows high-privilege users to inject malicious scripts affecting other users or the site. The vulnerability requires high attack complexity and high privileges to exploit. The impact is limited to low-level confidentiality and integrity compromise.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute in other users' browsers or affect site functionality.
Potential impact on your site
04Site Impact
A malicious admin could inject scripts to steal data from other users or modify site content.
Conditions required to exploit
05Prerequisites
Attacker must have high-level administrative privileges and exploit requires specific technical conditions.
Key dates
06Disclosure timeline
March 21, 2026
CVE published
April 8, 2026
Record updated
