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CVE-2026-2121 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:4.8 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

CNA: [email protected]CVSS-B:4.4 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://plugins.trac.wordpress.org/browser/show-posts/tags/1.8.1/includes/posts-widgets.php#L32	[email protected]	Source CodeVendor
https://plugins.trac.wordpress.org/browser/show-posts/tags/1.8.1/includes/posts-widgets.php#L45	[email protected]	Source CodeVendor
https://plugins.trac.wordpress.org/browser/show-posts/trunk/includes/posts-widgets.php#L32	[email protected]	Source CodeVendor
https://plugins.trac.wordpress.org/browser/show-posts/trunk/includes/posts-widgets.php#L45	[email protected]	Source CodeVendor
https://www.wordfence.com/threat-intel/vulnerabilities/id/e0d525ab-a86d-4750-9d16-731cbc0a626e?source=cve	[email protected]	AdvisoryRemedy
https://youtu.be/kbSqUuEAyho	[email protected]	Exploit

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-79	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')	[email protected]

Affected Products

Product	Versions
Weaver Show Posts	<= 1.8.1 (semver)
CPE cpe:2.3:a:weavertheme:weaver_show_posts::::::wordpress::* Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Mar 21, 2026	New CVE Received	[email protected]