CVE-2021-25929: Opennms Horizon

Medium severity, CVSS 4.8. EPSS: 1% chance of exploitation in the next 30 days.

In OpenNMS Horizon, versions opennms-1-0-stable through opennms-27.1.0-1; OpenNMS Meridian, versions meridian-foundation-2015.1.0-1 through meridian-foundation-2019.1.18-1; meridian-foundation-2020.1.0-1 through meridian-foundation-2020.1.6-1 are vulnerable to Stored Cross-Site Scripting since there is no validation on the input being sent to the `name` parameter in `noticeWizard` endpoint. Due to this flaw an authenticated attacker could inject arbitrary script and trick other admin users into downloading malicious files.

Affected products

• Opennms Horizon: from 1.0, before 27.1.1 (fixed in 27.1.1)
• Opennms Meridian: from 2015.1.0, before 2019.1.19 (fixed in 2019.1.19); from 2020.1.0, before 2020.1.7 (fixed in 2020.1.7)

Published 2021-05-20. Last modified 2026-06-17.