PT-2026-50649 · WordPress · Slideshow Gallery Lite

Athiwat Tiprasaharn · CVE-2026-2021 · Published 2026-06-18 · Updated 2026-06-18

Positive Technologies (AI Summary)

CVSS v3.1

6.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Slideshow Gallery LITE versions prior to 1.8.6

Description The Slideshow Gallery LITE plugin for WordPress contains a Stored Cross-Site Scripting issue. This occurs due to insufficient input sanitization and output escaping of user-supplied attributes, specifically within the alwaysauto shortcode attribute. Authenticated attackers with Contributor-level access or higher can inject arbitrary web scripts into pages, which then execute when a user visits the affected page.

Recommendations Update the plugin to a version later than 1.8.5. As a temporary workaround, restrict the use of the alwaysauto shortcode attribute by users with Contributor-level access until the update is applied.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-2021

Affected Products

Slideshow Gallery Lite

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-2021 · Security Note
• https://plugins.trac.wordpress.org/browser/slideshow-gallery/tags/1.8.5/slideshow-gallery.php#L558 · Note
• https://t.me/CVEtracker/57235 · Telegram Post
• https://plugins.trac.wordpress.org/browser/slideshow-gallery/tags/1.8.5/views/default/gallery.php#L192 · Note
• https://t.me/cveNotify/170605 · Telegram Post
• https://plugins.trac.wordpress.org/browser/slideshow-gallery/trunk/views/default/gallery.php#L192 · Note
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3567787%40slideshow-gallery&new=3567787%40slideshow-gallery&sfp_email=&sfph_mail= · Note
• https://plugins.trac.wordpress.org/browser/slideshow-gallery/trunk/slideshow-gallery.php#L558 · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/55d842fc-a750-4b59-a1d6-b3bd427dfe79?source=cve · Note