EUVD-2026-57718
GHSA-q2r2-4mh9-4268
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Arbitrary Java class loading via Class.forName enables OS-level code execution, making C:H/I:H/A:H appropriate; PR:L reflects mandatory authentication confirmed by CVSS vector.
Primary rating from Vendor (OpenNMS).
CVSS VectorVendor: OpenNMS
Lifecycle Timeline
3DescriptionCVE.org
A JEXL expression sandbox bypass exists in multiple versions of OpenNMS Meridian and Horizon. A low-privileged authenticated user can submit a crafted expression to the Measurements REST API that escapes the sandbox and loads arbitrary Java classes on the server. This can potentially allow an attacker to gain access to confidential information and compromise integrity.
The solution is to upgrade to Meridian 2024.3.12, 2025.0.9 and Horizon 36.0.3 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.
Articles & Coverage 1
AnalysisAI
JEXL expression sandbox bypass in OpenNMS Meridian and Horizon allows a low-privileged authenticated user to load arbitrary Java classes on the server via the Measurements REST API, enabling confidentiality disclosure and integrity compromise. The flaw stems from incorrect authorization logic in OnmsJexlUberspect that checked method calls on a whitelisted class object against the whitelisted class rather than against java.lang.Class itself, allowing reflection chains such as table.getClass().forName('java.lang.Runtime') to escape the sandbox. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid low-privileged OpenNMS account - the CVSS vector PR:L confirms authentication is mandatory. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS base score of 5.4 (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N) significantly understates practical impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to OpenNMS Meridian 2024.3.12 or 2025.0.9, or OpenNMS Horizon 36.0.3 or newer. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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