CVE-2026-15790
Received Received - Intake

Stored XSS in YouTube Showcase WordPress Plugin

Publication date: 2026-08-16

Last updated on: 2026-08-16

Assigner: Wordfence

Description
The Youtube Showcase plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 4.0.4 via the 'emd_mb_meta' shortcode. This is due to insufficient input sanitization and output escaping on attachment titles referenced by the shortcode's image field: EMD_MB_Helper::image_info() returns the attachment's raw post_title, and EMD_MB_Helper::shortcode() interpolates it into title="%s" HTML attributes via sprintf() without esc_attr(). This makes it possible for authenticated attackers, with author-level access and above (upload_files capability required to create the attachment, edit_posts/publish_posts to embed the shortcode), to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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Meta Information

Published
2026-08-16
Last Modified
2026-08-16
Generated
2026-08-16
AI Q&A
2026-08-16
EPSS Evaluated
N/A
NVD
CVE-2026-15790
EUVD
EUVD-2026-59894

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
emd youtube_showcase to 4.0.4 (inc)
wordpressextensions youtube_showcase to 4.0.4 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

The Youtube Showcase WordPress plugin up to version 4.0.4 has a stored Cross-Site Scripting (XSS) vulnerability. It occurs because the plugin does not properly sanitize or escape attachment titles used in the 'emd_mb_meta' shortcode. Attackers with author-level access can inject malicious scripts into pages via the image field, which execute when users view the page.

Detection Guidance

To detect this vulnerability, inspect WordPress sites using the Youtube Showcase plugin version 4.0.4 or lower. Check for malicious scripts in attachment titles referenced by the 'emd_mb_meta' shortcode. Review server logs for unusual activity from authenticated users with author-level access or higher.

Impact Analysis

If exploited, this vulnerability allows attackers to inject and execute arbitrary web scripts in your WordPress site. This could lead to unauthorized actions, data theft, or defacement of your website. Users visiting infected pages may have their sessions compromised or be redirected to malicious sites.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR or HIPAA by exposing user data to unauthorized parties. If attackers steal sensitive user information via injected scripts, it may violate data protection requirements for confidentiality and integrity.

Mitigation Strategies

Immediately update the Youtube Showcase plugin to the latest version. If an update is unavailable, disable the plugin until a patch is released. Remove any suspicious attachments or scripts injected via the 'emd_mb_meta' shortcode. Restrict author-level access to prevent further exploitation.

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