CVE-2026-8900: Spyrosvl Simple Seo Slideshow

Medium severity, CVSS 6.4. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Spyrosvl Simple Seo Slideshow: up to and including 1.2.8

Published 2026-06-06. Last modified 2026-07-23.