What’s Vulnerable › Vulnerabilities

CVE-2023-0846: Unauthenticated, stored XSS in display of alarm reduction-key

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-02-22 · updated 2026-06-17
• Weakness: CWE-79

Description

Unauthenticated, stored cross-site scripting in the display of alarm reduction keys in multiple versions of OpenNMS Horizon and Meridian 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.

Affected products

• The OpenNMS Group Horizon: before 31.0.4 — fixed in 31.0.4
• The OpenNMS Group Meridian: before 2023.1.0 — fixed in 2023.1.0

How to fix

Upgrade to a fixed version: The OpenNMS Group Horizon 31.0.4; The OpenNMS Group Meridian 2023.1.0. Check the vendor advisory for mitigations.

References

• https://docs.opennms.com/meridian/2022/releasenotes/changelog.html#releasenotes-changelog-Meridian-2022.1.13
• https://github.com/OpenNMS/opennms/pull/5506/files
• https://docs.opennms.com/meridian/2022/releasenotes/changelog.html#releasenotes-changelog-Meridian-2022.1.13
• https://github.com/OpenNMS/opennms/pull/5506/files

Get alerted when CVE-2023-0846 or the next vulnerability affects your stack