CVE-2023-0489: Slideonline Project Sideonline

Medium severity, CVSS 5.4. EPSS: 0.4% chance of exploitation in the next 30 days.

The SlideOnline WordPress plugin through 1.2.1 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks

Affected products

• Slideonline Project Sideonline: up to and including 1.2.1

Published 2023-06-19. Last modified 2026-06-17.