EUVD-2026-14151
GHSA-qf9c-wfj4-w8fw
Severity by source
AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
The Weaver Show Posts plugin for WordPress contains a Stored Cross-Site Scripting (XSS) vulnerability in the 'add_class' parameter due to insufficient input sanitization and output escaping. Authenticated attackers with Administrator-level access can inject arbitrary web scripts that execute when users access injected pages, with particular impact in multisite installations where Administrators lack the unfiltered_html capability. A proof-of-concept demonstration exists, though the CVSS 4.4 score reflects the high privilege requirement needed for exploitation.
Technical ContextAI
This vulnerability is an instance of CWE-79 (Improper Neutralization of Input During Web Page Generation), affecting the Weaver Show Posts plugin (CPE: cpe:2.3:a:wpweaver:weaver_show_posts:*:*:*:*:*:*:*:*) across all versions up to and including 1.8.1. The flaw resides in the posts-widgets.php file (lines 32 and 45 as referenced in the plugin repository) where the 'add_class' parameter is processed without proper sanitization before being rendered in HTML output. WordPress plugins typically execute PHP code server-side and output HTML to browsers; in this case, the plugin fails to escape user-supplied class attribute values, allowing attackers to break out of the attribute context and inject script tags or event handlers. The vulnerability manifests as Stored XSS because the malicious payload is persisted in the WordPress database (likely in widget settings or post metadata) and executed every time the affected page is rendered.
RemediationAI
Update the Weaver Show Posts plugin to a version released after 1.8.1 that includes input sanitization and output escaping fixes for the 'add_class' parameter; check the official WordPress plugin repository or vendor advisory (https://www.wordfence.com/threat-intel/vulnerabilities/id/e0d525ab-a86d-4750-9d16-731cbc0a626e) for the patched version number. Until a patch is available or applied, restrict Administrator-level access to trusted personnel only, conduct an audit of existing Show Posts widgets to identify any suspicious or unfamiliar class attributes in the plugin settings, and consider disabling the plugin if it is not actively used. In multisite installations, ensure that the unfiltered_html capability remains restricted and implement WordPress security hardening practices such as two-factor authentication for Administrator accounts and regular security scanning.
More in Weaver Show Posts
View allSame weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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