What the vulnerability does
01Description
The Simple SEO Slideshow plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Shortcode Attributes in all versions up to, and including, 1.2.8 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. WordPress KSES does not strip malicious shortcode attribute values on post save, allowing contributor-level users to persist payloads that execute for any visitor, including administrators reviewing the post.
Explanation of Vulnerability in Simple Terms
02Summary
Simple SEO Slideshow versions 1.2.8 and earlier contain a cross-site scripting vulnerability. An authenticated user with low privileges can inject malicious scripts that execute in other users' browsers, potentially affecting the entire site. The vulnerability requires network access but no user interaction from the victim.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that run in other users' browsers and affect site functionality.
Potential impact on your site
04Site Impact
Authenticated users can inject scripts affecting other site visitors and administrators.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege authenticated account; no victim interaction required.
Key dates
06Disclosure timeline
June 5, 2026
CVE published
June 6, 2026
Record updated
