CVE-2023-0869: Cross-site scripting in outage/list.htm in multiple versions of OpenNMS Meridian and Horizon allows an attacke

Q: How do I fix CVE-2023-0869?

horizon: upgrade to 31.0.4; meridian: upgrade to 2023.1.0. Exact commands for each OS are on this page.

Q: Is CVE-2023-0869 being exploited?

CVE-2023-0869 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-0869 affect?

CVE-2023-0869 affects horizon, meridian. Severity is medium (CVSS 5.8). Cross-site scripting in outage/list.htm in multiple versions of OpenNMS Meridian and Horizon allows an attacker access to confidential session information. The solution is to upgrade to Meridian 2023.1.0 or newer, or Horizon 31.0.4 or newer

Q: How urgent is CVE-2023-0869?

Priority 29/100. No elevated risk signals yet.

Routine

MEDIUM 5.8UPGRADEUPGRADE

CVE-2023-0869 is a medium-severity flaw (CVSS 5.8) affecting horizon, meridian. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting in outage/list.htm in multiple versions of OpenNMS Meridian and Horizon allows an attacker access to confidential session information. The solution is to upgrade to Meridian 2023.1.0 or newer, or Horizon 31.0.4 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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.8 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-20, CWE-79
Published	2023-02-23
Last modified	2026-06-17

Publisher (CNA): The OpenNMS Group · Vendor: opennms

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-02-23 15:15 UTCPublished CVE record published
2026-06-17 05:26 UTCUpdated Record last modified

opennms horizon UPGRADE

Affected: < 31.0.4

Fixed in: 31.0.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy horizon || rpm -q horizon || horizon --version

2. UPGRADE to 31.0.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade horizon

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade horizon

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

opennms meridian UPGRADE

Affected: < 2023.1.0

Fixed in: 2023.1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy meridian || rpm -q meridian || meridian --version

2. UPGRADE to 2023.1.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade meridian

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade meridian

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-0869?

horizon: upgrade to 31.0.4; meridian: upgrade to 2023.1.0. Exact commands for each OS are on this page.

Is CVE-2023-0869 being exploited?

CVE-2023-0869 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-0869 affect?

CVE-2023-0869 affects horizon, meridian. Severity is medium (CVSS 5.8). Cross-site scripting in outage/list.htm in multiple versions of OpenNMS Meridian and Horizon allows an attacker access to confidential session information. The solution is to upgrade to Meridian 2023.1.0 or newer, or Horizon 31.0.4 or newer

How urgent is CVE-2023-0869?

Priority 29/100. No elevated risk signals yet.

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References

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