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CVE-2025-53121

Stored XSS in multiple 33.0.8files in opennms/opennms

MEDIUM
6.9
CVSS Score
Published: June 26, 2025 at 06:51 PM UTC
Updated: June 17, 2026 at 09:37 AM UTC
2 products affected across 1 vendorMeridianHorizon

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Severity
MEDIUM6.9
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

Multiple stored XSS were found on different nodes with unsanitized parameters in OpenMNS Horizon 33.0.8 and versions earlier than 33.1.6 on multiple platforms that allow an attacker to store on database and then inject HTML and/or Javascript on the page. The solution is to upgrade to Horizon 33.1.6, 33.1.7 or Meridian 2024.2.6, 2024.2.7 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. OpenNMS thanks Fábio Tomé for reporting this issue.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Horizon· Opennms
60%
33.0.8 ≤ v < 33.1.6, 33.1.733.0.8
Affected range stops below 33.1.6, 33.1.7, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 33.0.8 (unknown)
Meridian· Opennms
60%
2023.1.20 ≤ v < 2024.2.6, 2024.2.72024.1.4 ≤ v < 2024.2.6, 2024.2.72023.1.202024.1.4
Affected range stops below 2024.2.6, 2024.2.7, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 2023.0.0 (unknown)
Vendor states this is fixed in 2024.0.0 (unknown)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Source: [email protected]
https://github.com/OpenNMS/opennms
Source: [email protected]
https://github.com/OpenNMS/opennms/pull/7708

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.9MEDIUMOpenNMS
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-79

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