CVE-2026-14876: Smart Slider 3 <= 3.5.1.38 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'data-href' Attribute in Custom HTML Block
The Smart Slider 3 plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'data-href' parameter 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.
Affected Software
Event History
Frequently Asked Questions
Who can exploit this issue?
An attacker must be authenticated to WordPress with contributor-level access or higher. They can inject scripts through the data-href parameter in a Smart Slider 3 Custom HTML Block.
Which sites are affected?
Sites using Nextend Smart Slider 3 versions up to and including 3.5.1.38 are affected. Exploitation does not require user interaction from the attacker, but the injected script runs when someone visits the affected page.
What can be done before updating?
Restrict contributor-level and higher accounts to trusted users, especially accounts able to create or modify Smart Slider 3 Custom HTML Blocks. Review pages containing those blocks for untrusted data-href values or injected script content.