CVE-2023-40312: Reflected XSS in multiple JSP files in opennms/opennms

Severity: medium (CVSS 5.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-08-14 · updated 2026-06-17
Weakness: CWE-79

Description

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

The OpenNMS Group Horizon: from 31.0.8 before 32.0.2 — fixed in 32.0.2
The OpenNMS Group Meridian: before 2020.1.38; from 2022.1.0 before 2022.1.19; from 2023.1.0 before 2023.1.6 — fixed in 2020.1.38, 2022.1.19, 2023.1.6

How to fix

Upgrade to a fixed version: The OpenNMS Group Horizon 32.0.2; The OpenNMS Group Meridian 2020.1.38, 2022.1.19, 2023.1.6. Check the vendor advisory for mitigations.

References

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