PT-2026-26828 · WordPress · Weaver Show Posts

Muqsith Barru · Published 2026-03-21 · Updated 2026-03-21 · CVE-2026-2121

Positive Technologies (AI Summary)

CVSS v3.1

4.4

Medium

Base vector

AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N

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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-2121

Affected Products

Weaver Show Posts

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2026-2121 · Security Note
• https://youtu.be/kbSqUuEAyho · Note
• https://plugins.trac.wordpress.org/browser/show-posts/trunk/includes/posts-widgets.php#L45 · Note
• https://twitter.com/CVEnew/status/2035237234073645173 · Twitter Post
• https://plugins.trac.wordpress.org/browser/show-posts/trunk/includes/posts-widgets.php#L32 · Note
• https://plugins.trac.wordpress.org/browser/show-posts/tags/1.8.1/includes/posts-widgets.php#L32 · Note
• https://plugins.trac.wordpress.org/browser/show-posts/tags/1.8.1/includes/posts-widgets.php#L45 · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/e0d525ab-a86d-4750-9d16-731cbc0a626e?source=cve · Note