CVE-2023-0846Unauthenticated, stored XSS in display of alarm reduction-key
- 6.7MediumCVSS base score
- 0.49%Exploitation in 30 daysEPSS · top 57% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By OpenNMS
- 7 days later
· 7 days later
Published
- 18 months later
· 18 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| OpenNMSCNA (assigner) | 3.1 | Medium6.7 | CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N |
| NVDNVD · Modified | 3.1 | Medium6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.49% · top 57% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.7.
Affected products
- affected 26.1.0 – < 31.0.4
- 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 Key</th> <td class="col-md-11" colspan="3"> <% if (alarm.getReductionKey() != null) {%> <%=alarm.getReductionKey()%> <% } else {%> <% }%> To: <th class="col-md-1">Reduction Key</th> <td class="col-md-11" colspan="3"> <% if (alarm.getReductionKey() != null) {%> <%=WebSecurityUtils.sanitizeString(alarm.getReductionKey())%> <% } else {%> <% }%> https://github.com/OpenNMS/opennms/pull/5506/files https://github.com/OpenNMS/opennms/pull/5506/files
References
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)
- EUVD EUVD-2023-0651 (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
[](https://cveledger.app/cve/CVE-2023-0846)Record last updated .