CVE-2025-53121

Stored XSS via unsanitized node parameters

Published Jun 26, 2025 · Updated Jun 26, 2025

Stored XSS in OpenNMS Horizon and Meridian allows remote authenticated users to execute HTML and JavaScript in another user's browser. Multiple node-related web views render database-backed user parameters without context-appropriate sanitization. A low-privileged user must reach the private-network web interface, store a crafted value, and induce another user to open an affected page; the script can read or alter data available to that user's session.

CVSS severity6.9
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in OpenNMS Horizon and Meridian allows remote authenticated users to execute HTML and JavaScript in another user's browser. Multiple node-related web views render database-backed user parameters without context-appropriate sanitization. A low-privileged user must reach the private-network web interface, store a crafted value, and induce another user to open an affected page; the script can read or alter data available to that user's session.

The record

CVE
CVE-2025-53121
Published
Jun 26, 2025
Updated
Jun 26, 2025
Vendor
The OpenNMS Group, Inc.
Product
OpenNMS Meridian
Classifications
CWE-79, T1203
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 26, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2023.1.20 <2024.2.6, 2024.2.7
  2. Affected versionversion=2024.1.4 <2024.2.6, 2024.2.7

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

The OpenNMS Group, Inc. · OpenNMS Meridianversion=2023.1.20 <2024.2.6, 2024.2.7; version=2024.1.4 <2024.2.6, 2024.2.7
The OpenNMS Group, Inc. · OpenNMS Horizonversion=33.0.8 <33.1.6, 33.1.7

Published CVSS scores

6.9The OpenNMS Group, Inc.CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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