CVE-2026-2121

MEDIUM EPSS 10.3%
Published Mar 21, 20263mo ago · Modified Jun 17, 20261w ago
4.4 CVSS 3.1
Medium
Find Similar
Published Mar 21, 2026 3mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
4.4
Exploitability
1.3
Impact
2.7
Vector string
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
Attack Vector Network
Attack Complexity High
Privileges Required High
User Interaction None
Scope Changed
Confidentiality Low
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
10.3% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

References 6

  • 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/tags/1.8.1/includes/posts-widgets.php#L45
  • 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/trunk/includes/posts-widgets.php#L45
  • wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/e0d525ab-a86d-4750-9d16-731cbc0a626e?source=cve
  • youtu.be https://youtu.be/kbSqUuEAyho

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.