CVE-2011-5026: Winn Guestbook

Medium severity, CVSS 4.3. EPSS: 1.6% chance of exploitation in the next 30 days.

Cross-site scripting (XSS) vulnerability in the addPost function in data/functions.php in Winn GuestBook before 2.4.8d allows remote attackers to inject arbitrary web script or HTML via the name parameter to index.php. NOTE: some of these details are obtained from third party information.

Affected products

• Winn Winn Guestbook: up to and including 2.4.8c; version 2.4.1 only; version 2.4.2 only; version 2.4.3 only; version 2.4.4 only; version 2.4.5 only; …

Published 2011-12-29. Last modified 2026-06-16.