🔐 CVE Alert

CVE-2026-2121

MEDIUM 4.4

Weaver Show Posts <= 1.8.1 - Authenticated (Administrator+) Stored Cross-Site Scripting via 'Additional Classes to Wrap Posts' Widget Setting

CVSS Score
4.4
EPSS Score
0.0%
EPSS Percentile
0th

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.

CWE CWE-79
Vendor wpweaver
Product weaver show posts
Published Mar 21, 2026
Last Updated Apr 8, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability

Affected Versions

wpweaver / Weaver Show Posts
0 ≤ 1.8.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗
wordfence.com: https://www.wordfence.com/threat-intel/vulnerabilities/id/e0d525ab-a86d-4750-9d16-731cbc0a626e?source=cve plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/show-posts/trunk/includes/posts-widgets.php#L32 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/show-posts/tags/1.8.1/includes/posts-widgets.php#L32 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/show-posts/trunk/includes/posts-widgets.php#L45 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/show-posts/tags/1.8.1/includes/posts-widgets.php#L45 youtu.be: https://youtu.be/kbSqUuEAyho

Credits

Muqsith Barru