CVE-2020-18661: Sir Gnuboard

Medium severity, CVSS 6.1. EPSS: 1.1% chance of exploitation in the next 30 days.

Cross Site Scripting (XSS) vulnerability in gnuboard5 <=v5.3.2.8 via the url parameter to bbs/login.php.

Affected products

• Sir Gnuboard: up to and including 5.3.2.8

Published 2021-06-24. Last modified 2026-06-17.