CVE-2026-15790: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in emarket-design Video Gallery – YouTube Gallery, Playlist & Video Grid
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.
AI Analysis
Technical Summary
CVE-2026-15790 is a stored cross-site scripting vulnerability in the Youtube Showcase WordPress plugin (Video Gallery – YouTube Gallery, Playlist & Video Grid) affecting versions up to 4.0.4. The flaw exists because the plugin's EMD_MB_Helper::image_info() function returns raw attachment post titles without sanitization, and EMD_MB_Helper::shortcode() inserts these titles into HTML attributes without proper escaping. Authenticated attackers with author-level permissions (upload_files, edit_posts, or publish_posts capabilities) can exploit this to inject malicious scripts that execute when users view the affected pages.
Potential Impact
An attacker with author-level access or higher can inject arbitrary web scripts into pages via the vulnerable shortcode, potentially leading to session hijacking, defacement, or other malicious actions executed in the context of users visiting the injected pages. The vulnerability does not allow privilege escalation or denial of service but compromises confidentiality and integrity of user sessions and data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict author-level access to trusted users only and consider disabling or removing the vulnerable plugin. Avoid embedding untrusted content via the affected shortcode to reduce risk.
CVE-2026-15790: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in emarket-design Video Gallery – YouTube Gallery, Playlist & Video Grid
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.
CVSS v3.1
Score 6.4medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-15790 is a stored cross-site scripting vulnerability in the Youtube Showcase WordPress plugin (Video Gallery – YouTube Gallery, Playlist & Video Grid) affecting versions up to 4.0.4. The flaw exists because the plugin's EMD_MB_Helper::image_info() function returns raw attachment post titles without sanitization, and EMD_MB_Helper::shortcode() inserts these titles into HTML attributes without proper escaping. Authenticated attackers with author-level permissions (upload_files, edit_posts, or publish_posts capabilities) can exploit this to inject malicious scripts that execute when users view the affected pages.
Potential Impact
An attacker with author-level access or higher can inject arbitrary web scripts into pages via the vulnerable shortcode, potentially leading to session hijacking, defacement, or other malicious actions executed in the context of users visiting the injected pages. The vulnerability does not allow privilege escalation or denial of service but compromises confidentiality and integrity of user sessions and data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict author-level access to trusted users only and consider disabling or removing the vulnerable plugin. Avoid embedding untrusted content via the affected shortcode to reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-07-14T19:30:01.178Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a814d96bf8831d5398c6a52
Added to database: 08/16/2026, 05:41:42 UTC
Last enriched: 08/16/2026, 05:58:41 UTC
Last updated: 08/17/2026, 00:55:11 UTC
Views: 13
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