Stored Cross-Site Scripting in Weaver Show Posts Plugin for WordPress
CVE-2026-2121

4.4MEDIUM

Key Information:

Vendor

WordPress
Status
Weaver Show Posts
Vendor
CVE Published:
21 March 2026

What is CVE-2026-2121?

The Weaver Show Posts plugin for WordPress contains a vulnerability that allows authenticated users with Administrator-level access to perform Stored Cross-Site Scripting attacks. This issue arises from insufficient input sanitization and output escaping related to the 'add_class' parameter. Attackers can inject arbitrary web scripts, which execute whenever a user accesses the manipulated page, posing significant risks—especially in multisite installations where specific Administrator capabilities may be limited.

Affected Version(s)

Weaver Show Posts 0 <= 1.8.1

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/show-posts/tru...
https://plugins.trac.wordpress.org/browser/show-posts/tag...

CVSS V3.1

Score:
4.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
High
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Muqsith Barru
.