What is CVE-2023-0867?

CVE-2023-0867 is a medium-severity vulnerability in Opennms Horizon, classified under Improper Input Validation. CVSS score: 6.7/10. Published 2023-02-23.

How severe is CVE-2023-0867?

Medium severity. CVSS v3 base score is 6.7 out of 10.

XSS in Opennms Horizon

CVE-2023-0867

Multiple stored and reflected cross-site scripting vulnerabilities in webapp jsp pages in multiple versions of OpenNMS Meridian and Horizon could allow an attacker access to confidential session information. Users should upgrade to Meridian 2023.1.0 or newer, or Horizon 31.0.4. 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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2023-02-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (34.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Opennms Horizon
Opennms Meridian
The Opennms Group Horizon — versions 26.0.0
The Opennms Group Meridian — versions 2020.1.0, 2021.1.0, 2022.1.0

Weakness classification (CWE)

References

github.com/OpenNMS/opennms/pull/5765 (Patch)
docs.opennms.com/meridian/2022/releasenotes/changelog.html (Release Notes)

Frequently asked questions

What is CVE-2023-0867?: CVE-2023-0867 is a medium-severity vulnerability in Opennms Horizon, classified under Improper Input Validation. CVSS score: 6.7/10. Published 2023-02-23.
How severe is CVE-2023-0867?: Medium severity. CVSS v3 base score is 6.7 out of 10.