CVE-2026-15798
Received Received - Intake

Stored XSS in Smart Slider 3 WordPress Plugin

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: Wordfence

Description
The Smart Slider 3 plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'slider' Block Attribute in all versions up to, and including, 3.5.1.38 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The injected scripts execute specifically when a user opens the affected post in the WordPress block editor, making Editors and Administrators the primary targets.

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Meta Information

Published
2026-08-28
Last Modified
2026-08-28
Generated
2026-08-28
AI Q&A
2026-08-28
EPSS Evaluated
N/A
NVD
CVE-2026-15798
EUVD
EUVD-2026-67399

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
smart_slider smart_slider_3 to 3.5.1.38 (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 Smart Slider 3 WordPress plugin up to version 3.5.1.38 has a stored cross-site scripting (XSS) vulnerability. It allows authenticated attackers with contributor access or higher to inject malicious scripts via the slider block attribute. These scripts execute when a user opens an affected post in the WordPress block editor.

Detection Guidance

Check if the Smart Slider 3 plugin version is 3.5.1.38 or lower. Log in to WordPress admin, go to Plugins, and verify the installed version. If vulnerable, inspect posts containing sliders for unusual scripts in the block editor.

Impact Analysis

Attackers could steal user sessions, deface websites, or redirect visitors to malicious sites. Editors and administrators are most at risk since they interact with posts in the block editor where the scripts execute.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR (data protection) and HIPAA (health data privacy) requirements. Organizations may face fines or legal consequences if exploited.

Mitigation Strategies

Update the Smart Slider 3 plugin to the latest version immediately. If an update is unavailable, consider disabling the plugin temporarily until a patch is released. Review user roles to limit contributor-level access.

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