Unauthenticated, stored XSS in display of alarm reduction-key

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.

Scores

EPSS (exploitation in 30 days)

0.49% · top 57% of all CVEs (6 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.7.

Weakness

• CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (opens in a new tab)All about CWE-79 and its CVEs

Affected products

• The OpenNMS Group · Horizon

  • affected 26.1.0 – < 31.0.4

• The OpenNMS Group · Meridian

  • affected 2020.1.0 – < 2020.1.32
  • affected 2021.1.0 – < 2021.1.24
  • affected 2022.1.0 – < 2022.1.13
  • unaffected 2023.1.0

Affected packages

From reviewed advisories of the GitHub Advisory Database.

• Mavenorg.opennms:opennmsGHSA-79jr-8fhm-8wv3 (opens in a new tab)

What to do

Solution: https://github.com/OpenNMS/opennms/pull/5506/files Upgrade to a newer version of Meridian or Horizon. Or change the details.jsp file as follows:  Change:  <th class="col-md-1">Reduction&nbsp;Key</th>         <td class="col-md-11" colspan="3">             <% if (alarm.getReductionKey() != null) {%>             <%=alarm.getReductionKey()%>             <% } else {%>             &nbsp;             <% }%> To: <th class="col-md-1">Reduction&nbsp;Key</th>         <td class="col-md-11" colspan="3">             <% if (alarm.getReductionKey() != null) {%>             <%=WebSecurityUtils.sanitizeString(alarm.getReductionKey())%>             <% } else {%>             &nbsp;             <% }%> https://github.com/OpenNMS/opennms/pull/5506/files https://github.com/OpenNMS/opennms/pull/5506/files

References (2)

• https://github.com/OpenNMS/opennms/pull/5506/files (opens in a new tab)x_transferred
• https://docs.opennms.com/meridian/2022/releasenotes/changelog.html#releasenotes-changelog-Meridian-2022.1.13 (opens in a new tab)x_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisory GHSA-79jr-8fhm-8wv3 (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2023-0846](https://trackcve.app/badge/CVE-2023-0846.svg)](https://trackcve.app/cve/CVE-2023-0846)

Record last updated 2 Aug 2024, 05:24 UTC.