CVE-2021-24980: Gwolle Guestbook Project Gwolle Guestbook

Medium severity, CVSS 6.1. EPSS: 0.8% chance of exploitation in the next 30 days.

The Gwolle Guestbook WordPress plugin before 4.2.0 does not sanitise and escape the gwolle_gb_user_email parameter before outputting it back in an attribute, leading to a Reflected Cross-Site Scripting issue in an admin page

Affected products

• Gwolle Guestbook Project Gwolle Guestbook: before 4.2.0 (fixed in 4.2.0)

Published 2021-12-27. Last modified 2026-06-17.