CVE-2021-27520: Fudforum

Medium severity, CVSS 6.1. EPSS: 6.4% chance of exploitation in the next 30 days.

A cross-site scripting (XSS) issue in FUDForum 3.1.0 allows remote attackers to inject JavaScript via index.php in the "author" parameter.

Affected products

• Fudforum Fudforum: version 3.1.0 only

Published 2021-03-19. Last modified 2026-06-17.