CVE-2026-15798: Smart Slider 3 <= 3.5.1.38 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'slider' Block Attribute
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.
Affected Software
Event History
Frequently Asked Questions
Who can exploit this issue, and who is most at risk from the payload?
An attacker needs an authenticated WordPress account with at least Contributor-level access. The stored payload is primarily triggered when an Editor or Administrator opens the affected post in the WordPress block editor.
Does merely viewing the published page trigger the injected script?
The available information specifies that the script executes when the injected post is opened in the WordPress block editor. It does not state that normal front-end page views trigger the payload.
Which installations are affected?
Smart Slider 3 versions up to and including 3.5.1.38 are affected. Exploitation depends on contributors or other lower-privileged authenticated users being able to create or modify content containing the slider block attribute.