CVE-2026-2121: Weaver Show Posts <= 1.8.1 - Authenticated (Administrator+) Stored Cross-Site Scripting via 'Additional Classes to Wrap Posts' Widget Setting
The Weaver Show Posts plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'addclass' 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 unfilteredhtml capability.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-2121?
CVE-2026-2121 has a medium severity level due to its potential for stored cross-site scripting attacks.
How do I fix CVE-2026-2121?
To fix CVE-2026-2121, upgrade the Weaver Show Posts plugin to version 1.8.2 or later.
Who is affected by CVE-2026-2121?
CVE-2026-2121 affects all users of the Weaver Show Posts plugin for WordPress versions up to and including 1.8.1.
What type of vulnerability is CVE-2026-2121?
CVE-2026-2121 is a stored cross-site scripting vulnerability.
Can CVE-2026-2121 be exploited remotely?
Yes, CVE-2026-2121 can be exploited remotely by authenticated users with administrator access.