CVE-2026-19135
OpenNMS JEXL sandbox bypass in Measurements REST API allows ROLE_USER to load arbitrary classes
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
OpenNMS JEXL sandbox bypass in Measurements REST API allows ROLE_USER to load arbitrary classes
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.
- Record
CVE-2026-19135- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-470
- Updated
- 2026-11-02
EUVDEUVD-2026-57718
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.
- Record
EUVD-2026-57718- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-q2r2-4mh9-4268
A JEXL expression sandbox bypass exists in multiple versions of OpenNMS Meridian and Horizon. A...
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.
- Record
GHSA-q2r2-4mh9-4268- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-470
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-19135- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-470
- Updated
- 2026-11-02
OSV
OpenNMS JEXL sandbox bypass in Measurements REST API allows ROLE_USER to load arbitrary classes
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.
- Record
CVE-2026-19135- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-470
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-19135
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.
- Record
UBUNTU-CVE-2026-19135- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
horizonUbuntu:16.04:LTS |
All versions, plus listed versions 2:8.0.0-0ubuntu22:9.0.0~b1-0ubuntu12:9.0.0~b1-0ubuntu22:9.0.0~b2-0ubuntu12:9.0.0~b3-0ubuntu1 Show 12 moreShow less2:9.0.0~rc1-0ubuntu12:9.0.0-0ubuntu12:9.0.0-0ubuntu22:9.0.0-0ubuntu2.16.04.12:9.0.1-0ubuntu22:9.1.0-0ubuntu12:9.1.1-0ubuntu12:9.1.2-0ubuntu12:9.1.2-0ubuntu22:9.1.2-0ubuntu32:9.1.2-0ubuntu52:9.1.2-0ubuntu5.2 |
None known |
horizonUbuntu:18.04:LTS |
All versions, plus listed versions 3:12.0.0-0ubuntu2.13:12.0.0-0ubuntu33:13.0.0~b1-0ubuntu13:13.0.0~b1-0ubuntu23:13.0.0-0ubuntu1 Show 12 moreShow less3:13.0.0-0ubuntu1.13:13.0.1-0ubuntu13:13.0.1-0ubuntu23:13.0.1-0ubuntu33:13.0.1-0ubuntu43:13.0.1-0ubuntu53:13.0.1-0ubuntu63:13.0.2-0ubuntu13:13.0.2-0ubuntu23:13.0.2-0ubuntu33:13.0.3-0ubuntu13:13.0.3-0ubuntu2 |
None known |
horizonUbuntu:Pro:20.04:LTS |
All versions, plus listed versions 3:16.0.0-0ubuntu13:17.0.0~b1~git2019121712.f7313b74c-0ubuntu13:18.0.1~git2020021409.bb959361b-0ubuntu23:18.0.1~git2020021409.bb959361b-0ubuntu33:18.2.1~git2020032709.2c4470272-0ubuntu1 Show 14 moreShow less3:18.2.1~git2020041013.754804667-0ubuntu13:18.2.1~git2020041013.754804667-0ubuntu23:18.2.1~git2020041013.754804667-0ubuntu33:18.3.2-0ubuntu0.20.04.13:18.3.2-0ubuntu0.20.04.23:18.3.2-0ubuntu0.20.04.43:18.3.3-0ubuntu13:18.3.4-0ubuntu13:18.3.5-0ubuntu13:18.3.5-0ubuntu23:18.3.5-0ubuntu2.13:18.3.5-0ubuntu2.23:18.3.5-0ubuntu2.33:18.3.5-0ubuntu2.3+esm1 |
None known |
horizonUbuntu:22.04:LTS |
All versions, plus listed versions 4:20.1.0-0ubuntu14:20.2.0+git2021120911.fc1012628-0ubuntu14:20.2.0+git2022011216.8fe5bbc8d-0ubuntu14:21.0.0+git2022030313.dd9e4c82b-0ubuntu24:22.1.0-0ubuntu1 Show 4 moreShow less4:22.1.0-0ubuntu24:22.1.0-0ubuntu2.14:22.1.1-0ubuntu14:22.1.1-0ubuntu1.1 |
None known |
horizonUbuntu:24.04:LTS |
All versions, plus listed versions 4:23.3.0-0ubuntu14:23.3.0-0ubuntu24:23.4.0+git2024011916.a77818d7-0ubuntu14:24.0.0-0ubuntu14:24.0.0-0ubuntu1.1 Show 4 moreShow less4:24.0.0-0ubuntu1.24:24.0.0-0ubuntu1.34:24.0.1-0ubuntu0.24.04.14:24.0.1-0ubuntu0.24.04.2 |
None known |
horizonUbuntu:26.10 |
All versions, plus listed versions 4:25.7.1-0ubuntu14:26.0.0-0ubuntu14:27.0.0-0ubuntu1 |
None known |
horizonUbuntu:26.04:LTS |
All versions, plus listed versions 4:25.5.1-0ubuntu14:25.5.1-0ubuntu24:25.5.1+git2026012819.479212220-0ubuntu14:25.7.1-0ubuntu1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-19135 is a medium vulnerability (CVSS 5.4) in Openstack Horizon, published August 13, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.29%, the 21st percentile. No source names a fixed version.