CVE-2023-0147: Flexible Captcha Project Flexible Captcha

Medium severity, CVSS 5.4. EPSS: 0.6% chance of exploitation in the next 30 days.

The Flexible Captcha WordPress plugin through 4.1 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

• Flexible Captcha Project Flexible Captcha: up to and including 4.1

Published 2023-02-06. Last modified 2026-06-17.