CVE-2021-40509: Jforum

Medium severity, CVSS 5.4. EPSS: 1% chance of exploitation in the next 30 days.

ViewCommon.java in JForum2 2.7.0 allows XSS via a user signature.

Affected products

• Jforum Jforum: version 2.7.0 only

Published 2021-09-04. Last modified 2026-06-17.