CVE-2023-40312: Opennms Horizon

Medium severity, CVSS 5.2. EPSS: 0.6% chance of exploitation in the next 30 days.

Multiple reflected XSS were found on different JSP files with unsanitized parameters in OpenMNS Horizon 31.0.8 and versions earlier than 32.0.2 on multiple platforms that an attacker can modify to craft a malicious XSS payload. The solution is to upgrade to Meridian 2023.1.6, 2022.1.19, 2021.1.30, 2020.1.38 or Horizon 32.0.2 or newer. Meridian and Horizon installation instructions state that they are intended for installation within an organization's private networks and should not be directly accessible from the Internet. OpenNMS thanks Jordi Miralles Comins for reporting this issue.

Affected products

• Opennms Horizon: from 31.0.8, before 32.0.2 (fixed in 32.0.2)
• Opennms Meridian: before 2020.1.38 (fixed in 2020.1.38); from 2022.1.0, before 2022.1.19 (fixed in 2022.1.19); from 2023.1.0, before 2023.1.6 (fixed in 2023.1.6)

Published 2023-08-14. Last modified 2026-06-17.