Executive brief
The Slideshow Gallery LITE plugin for WordPress, which is used to create image galleries on websites, contains a security flaw that allows users with contributor-level access to inject malicious scripts into pages. When other users or administrators visit these affected pages, the hidden scripts will execute in their browsers. This could lead to unauthorized actions being performed on behalf of the victim or the theft of sensitive session information.
Technical details
The Slideshow Gallery LITE plugin for WordPress is vulnerable to Stored Cross-Site Scripting (XSS) due to insufficient input sanitization and output escaping on the 'alwaysauto' shortcode attribute. This vulnerability exists in all versions up to and including 1.8.5. An authenticated attacker with Contributor-level permissions or higher can exploit this by embedding malicious JavaScript within a shortcode on a post or page. Because the input is stored in the database and rendered without proper neutralization (CWE-79), the script will execute in the context of any user's browser who views the affected content. A patch appears to be available in the plugin's trunk/latest changeset.
Affected products
- Tribulant Slideshow Gallery LITE up to, and including, 1.8.5
Timeline
- 2026-06-18: disclosed
- 2026-06-18: advisory
References
- https://plugins.trac.wordpress.org/browser/slideshow-gallery/tags/1.8.5/slideshow-gallery.php
- https://plugins.trac.wordpress.org/browser/slideshow-gallery/tags/1.8.5/views/default/gallery.php
- https://plugins.trac.wordpress.org/browser/slideshow-gallery/trunk/slideshow-gallery.php
- https://plugins.trac.wordpress.org/browser/slideshow-gallery/trunk/views/default/gallery.php
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3567787%40slideshow-gallery&new=3567787%40slideshow-gallery&sfp_email=&sfph_mail=
- https://www.wordfence.com/threat-intel/vulnerabilities/id/55d842fc-a750-4b59-a1d6-b3bd427dfe79?source=cve