CVE-2026-8873: Celloexpressions Content Slideshow

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

The Content Slideshow plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Shortcode Attributes in all versions up to, and including, 2.4.1 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.

Affected products

• Celloexpressions Content Slideshow: up to and including 2.4.1

Published 2026-05-27. Last modified 2026-06-17.