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CVE-2026-19135— OpenNMS JEXL sandbox bypass in Measurements REST API allows ROLE_USER to load arbitrary classes

Quick assessment

Affected
The OpenNMS Group Meridian
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenNMS是OpenNMS公司开源的一款网络管理监控系统。 OpenNMS 2024.1.0版本至2024.3.12之前版本、2025.0.0版本至2025.0.9之前版本和OpenNMS Horizon 36.0.0版本至36.0.3之前版本存在代码注入漏洞，该漏洞源于JEXL表达式沙箱绕过，低权限认证用户可通过Measurements REST API提交特制表达式，逃逸沙箱并加载任意Java类，可能导致攻击者访问机密信息并破坏完整性。

CVSS 5.4 · Medium EPSS 0.29% · P19

Affected Version Matrix 3

VendorProduct Version RangeStatus
The OpenNMS Group Horizon 36.0.0< 36.0.3 affected
The OpenNMS Group Meridian 2024.1.0< 2024.3.12 affected
2025.0.0< 2025.0.9 affected
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I. Basic Information for CVE-2026-19135

Vulnerability Information
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Vulnerability Title
OpenNMS JEXL sandbox bypass in Measurements REST API allows ROLE_USER to load arbitrary classes
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用外部可控制的输入来选择类或代码(不安全的反射)
Source: CVE Program / CVE List V5
Vulnerability Title
OpenNMS 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenNMS是OpenNMS公司开源的一款网络管理监控系统。 OpenNMS 2024.1.0版本至2024.3.12之前版本、2025.0.0版本至2025.0.9之前版本和OpenNMS Horizon 36.0.0版本至36.0.3之前版本存在代码注入漏洞，该漏洞源于JEXL表达式沙箱绕过，低权限认证用户可通过Measurements REST API提交特制表达式，逃逸沙箱并加载任意Java类，可能导致攻击者访问机密信息并破坏完整性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
The OpenNMS Group Meridian 2024.1.0 ~ 2024.3.12 -
The OpenNMS Group Horizon 36.0.0 ~ 36.0.3 -

II. Public POCs for CVE-2026-19135

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III. Intelligence Information for CVE-2026-19135

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Patches & Fixes for CVE-2026-19135 (1)

IV. Related Vulnerabilities

Same product: Meridian
Same vendor: The OpenNMS Group
Same weakness: CWE-470

V. Comments for CVE-2026-19135

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