EUVD-2026-37868
GHSA-5qqr-q6rw-943w
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Stored XSS impact requires victim page visit (UI:R); Contributor access mandatory (PR:L); scope changes to victim browser (S:C); no availability impact.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
2DescriptionCVE.org
The Slideshow Gallery LITE plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'alwaysauto' shortcode attribute in all versions up to, and including, 1.8.5. This is due to insufficient input sanitization and output escaping on user-supplied attributes. 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.
AnalysisAI
Stored Cross-Site Scripting in the Slideshow Gallery LITE WordPress plugin (all versions through 1.8.5) allows authenticated attackers with Contributor-level access to persistently inject arbitrary JavaScript via the 'alwaysauto' shortcode attribute, which then executes in the browser of any user who visits the affected page. The root cause is insufficient input sanitization and output escaping on user-supplied shortcode attributes, a classic CWE-79 pattern. The scope change in the CVSS vector (S:C) reflects that the injected script runs outside the plugin's security context - in victim users' browsers - enabling session hijacking, credential theft, or admin account takeover. No public exploit or CISA KEV listing has been identified at time of analysis.
Technical ContextAI
The vulnerability resides in the Slideshow Gallery LITE plugin (CPE: cpe:2.3:a:contrid:slideshow_gallery_lite:*:*:*:*:*:*:*:*) developed by Contrid for WordPress. WordPress shortcodes allow registered users to embed dynamic content in posts and pages; contributor-level users can author posts that contain shortcode markup. The 'alwaysauto' attribute on the plugin's shortcode is passed through to rendered HTML output without sanitization via wp_kses or equivalent escaping (esc_attr/esc_html), violating WordPress plugin development best practices. The vulnerable rendering logic is confirmed in the plugin source at gallery.php line 192 and slideshow-gallery.php line 558 (tags/1.8.5 and trunk). CWE-79 (Improper Neutralization of Input During Web Page Generation) is the root cause class - user-controlled data flows from shortcode attribute intake directly into HTML output without sanitization, creating a persistent injection point that persists in the WordPress database across page loads.
RemediationAI
A fix has been committed upstream in Trac changeset 3567787 (https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3567787%40slideshow-gallery&new=3567787%40slideshow-gallery); however, the specific released patched version number has not been independently confirmed from the available input data - site owners should update to the latest available version of Slideshow Gallery LITE from the WordPress plugin repository and verify the installed version is newer than 1.8.5. As a compensating control where immediate patching is not possible, restrict the Contributor role from being assigned to untrusted users, or use a role management plugin to remove shortcode execution capability from Contributor-level accounts - note this may affect legitimate content workflows. Alternatively, a Web Application Firewall (WAF) rule targeting the 'alwaysauto' parameter with script-bearing payloads can block exploitation attempts at the perimeter, though this does not address the underlying flaw and may produce false positives on legitimate shortcode usage. Consult the Wordfence advisory at https://www.wordfence.com/threat-intel/vulnerabilities/id/55d842fc-a750-4b59-a1d6-b3bd427dfe79 for updated patch version confirmation.
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External POC / Exploit Code
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