WordPress · Weaver Show Posts · CVE-2026-2121
**Name of the Vulnerable Software and Affected Versions**
Weaver Show Posts plugin for WordPress versions up to and including 1.8.1
**Description**
The software is susceptible to Stored Cross-Site Scripting through the `add class` parameter. Insufficient input sanitization and output escaping on user-supplied attributes allows authenticated attackers with Administrator-level access or higher to inject arbitrary web scripts into pages. These scripts will execute when a user accesses the injected page, primarily impacting multisite installations where Administrators lack the unfiltered html capability.
**Recommendations**
Update the Weaver Show Posts plugin to a version beyond 1.8.1.