Summaryinfo

A vulnerability identified as problematic has been detected in wpweaver Weaver Show Posts Plugin up to 1.8.1 on WordPress. This impacts an unknown function of the component Parameters Handler. This manipulation of the argument add_class causes cross site scripting. This vulnerability is tracked as CVE-2026-2121. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in wpweaver Weaver Show Posts Plugin up to 1.8.1 on WordPress. Affected by this vulnerability is some unknown functionality of the component Parameters Handler. The manipulation of the argument add_class with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

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.

The weakness was disclosed by Muqsith Barru. It is possible to read the advisory at wordfence.com. This vulnerability is known as CVE-2026-2121 since 02/06/2026. The exploitation appears to be difficult. The attack can be launched remotely. Additional levels of successful authentication are required for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 1.8.1 eliminates this vulnerability.

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Productinfo

Type

• WordPress Plugin

Vendor

• wpweaver

Name

• Weaver Show Posts Plugin

Version

• 1.8.0
• 1.8.1

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