How severe is CVE-2023-0846?

CVE-2023-0846 has a CVSS score of 6.7/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2023-0846?

CVE-2023-0846 affects the following packages: org.opennms:opennms (Maven). Ecosystems affected: Maven.

How do I fix CVE-2023-0846?

Update org.opennms:opennms to 31.0.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-0846 is resolved across your whole dependency graph.

How do I detect CVE-2023-0846 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.opennms:opennms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2023-0846 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2023-0846 actively exploited in the wild?

No public exploit code has been indexed for CVE-2023-0846 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2023-0846?

CVE-2023-0846 has an EPSS (Exploit Prediction Scoring System) score of 0.5%, placing it in the 42th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2023-0846?

CVE-2023-0846 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2023-0846 published, and has it been updated?

CVE-2023-0846 was published on February 22, 2023 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven

Not in CISA KEV

MEDIUM severity

CVE-2023-0846 — opennms

MEDIUMFix: OpenNMS/opennms#5506

CVE-2023-0846 is a medium-severity (CVSS 6.7) Cross-site Scripting (XSS) vulnerability in org.opennms:opennms. A fix is available for org.opennms:opennms — see the affected versions and patch details below.

Unauthenticated, stored XSS in display of alarm reduction-key

Also known asGHSA-79jr-8fhm-8wv3

Published

Feb 22, 2023

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Oct 31, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.5%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs42th percentile — riskier than 42% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

☕org.opennms:opennms

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

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 Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.opennms:opennms`	all versions	31.0.3`org.opennms:opennms:31.0.3`

Affected Products

2 products · 2 configurations

Application

horizonopennms

< 31.0.4

range

Application

meridianopennms

< 2023.1.0

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.opennms:opennms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.opennms:opennms to 31.0.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-0846 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2023-0846 in your dependencies?

Find it across Maven, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.7/10CVSS v3 base

Vector breakdown

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Raw vector

CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

OpenSSF Scorecard

Package health score

opennms

3.2/10

Code-Review5/10

Maintained10/10

Branch-ProtectionN/A

Assessed Oct 26, 2026

Timeline

Disclosed

Feb 22, 2023

Last updated

Oct 28, 2026

Identifiers

CVE-2023-0846

GHSA-79jr-8fhm-8wv3

References

Advisorygithub.com · CVE 2023 0846.json Advisorynvd.nist.gov · CVE 2023 0846 Webdocs.opennms.com · changelog Webgithub.com · OpenNMS Webgithub.com · files Webissues.opennms.org · NMS 14877 Packagegithub.com · opennms

Related vulnerabilities

This CVE is medium severity; 8 of 8 other CVEs affecting opennms are rated as high or higher (top: high).

CVE-2023-0815CVE-2023-0867CVE-2021-25934CVE-2021-3396CVE-2021-25931CVE-2021-25933CVE-2021-25929CVE-2021-25930

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 28, 2026