CVE-2026-89054 OpenNMS missing authorization on /api/v2 PATCH endpoints allows unauthenticated configuration changes

A missing authorization vulnerability in OpenNMS Horizon allows configuration changes without authentication. The Spring Security policy for the /api/v2 REST API defines authorization rules for every HTTP method except PATCH, so the shipped @PATCH configuration endpoints for event configuration a...

CVE-2026-89089: Improper Neutralization of Special Elements used in an SQL Command

A SQL injection vulnerability exists in the JasperReports-based reporting feature of multiple versions of OpenNMS Meridian and Horizon. A low-privileged authenticated user ROLEUSER can run the shipped, default-enabled online reports "Maintenance contracts expired" AssetManagementMaintExpired and...

PT-2026-89588

A SQL injection vulnerability exists in the JasperReports-based reporting feature of multiple versions of OpenNMS Meridian and Horizon. A low-privileged authenticated user ROLE USER can run the shipped, default-enabled online reports "Maintenance contracts expired" AssetManagementMaintExpired and...

CVE-2026-19596: Improper Restriction of XML External Entity Reference

An XML External Entity XXE vulnerability exists in the XML collector of multiple versions of OpenNMS Meridian and Horizon. When OpenNMS collects XML from a source whose response is attacker-controlled for example a compromised monitored host or an HTTP man-in-the-middle position, the collector's...

PT-2026-89577

An XML External Entity XXE vulnerability exists in the XML collector of multiple versions of OpenNMS Meridian and Horizon. When OpenNMS collects XML from a source whose response is attacker-controlled for example a compromised monitored host or an HTTP man-in-the-middle position, the collector's...

CVE-2026-89054: Missing Authorization

A missing authorization vulnerability in OpenNMS Horizon allows configuration changes without authentication. The Spring Security policy for the /api/v2 REST API defines authorization rules for every HTTP method except PATCH, so the shipped @PATCH configuration endpoints for event configuration a...

PT-2026-89576

A missing authorization vulnerability in OpenNMS Horizon allows configuration changes without authentication. The Spring Security policy for the /api/v2 REST API defines authorization rules for every HTTP method except PATCH, so the shipped @PATCH configuration endpoints for event configuration a...

JEXL Expression Sandbox Bypass

org.opennms, opennms-util are vulnerable to a JEXL expression sandbox bypass. The vulnerability is due to insufficient sandbox restrictions when processing crafted JEXL expressions through the Measurements REST API, which allows a low-privileged authenticated attacker to escape the sandbox and lo...

Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')

Overview Affected versions of this package are vulnerable to Use of Externally-Controlled Input to Select Classes or Code 'Unsafe Reflection' through the OnmsJexlUberspect.getMethod method in the Measurements REST API. An attacker can load arbitrary Java classes on the server by submitting a...

CVE-2026-19182

An incorrect authorization check in the v2 Alarm REST API in OpenNMS Meridian and Horizon allows a low-privileged authenticated user ROLEREST to acknowledge, escalate, or clear alarms recorded as an arbitrary username, and, when also assigned ROLEREADONLY, to modify alarm state despite the...

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...

UBUNTU-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...

CVE-2026-19182

An incorrect authorization check in the v2 Alarm REST API in OpenNMS Meridian and Horizon allows a low-privileged authenticated user ROLEREST to acknowledge, escalate, or clear alarms recorded as an arbitrary username, and, when also assigned ROLEREADONLY, to modify alarm state despite the...

CVE-2026-19182 OpenNMS v2 Alarm REST API inverted authorization check lets ROLE_REST users acknowledge alarms as any user and bypass read-only

An incorrect authorization check in the v2 Alarm REST API in OpenNMS Meridian and Horizon allows a low-privileged authenticated user ROLEREST to acknowledge, escalate, or clear alarms recorded as an arbitrary username, and, when also assigned ROLEREADONLY, to modify alarm state despite the...

CVE-2026-19182

Summary of vulnerability details (CVE-2026-19182) : OpenNMS Meridian and Horizon contain an inverted authorization check in the v2 Alarm REST API. A low-privileged authenticated user (ROLE_REST) can acknowledge, escalate, or clear alarms recorded as an arbitrary username, and if also granted ROLE...

CVE-2026-19182 OpenNMS v2 Alarm REST API inverted authorization check lets ROLE_REST users acknowledge alarms as any user and bypass read-only

An incorrect authorization check in the v2 Alarm REST API in OpenNMS Meridian and Horizon allows a low-privileged authenticated user ROLEREST to acknowledge, escalate, or clear alarms recorded as an arbitrary username, and, when also assigned ROLEREADONLY, to modify alarm state despite the...

EUVD-2026-57719

An incorrect authorization check in the v2 Alarm REST API in OpenNMS Meridian and Horizon allows a low-privileged authenticated user ROLEREST to acknowledge, escalate, or clear alarms recorded as an arbitrary username, and, when also assigned ROLEREADONLY, to modify alarm state despite the...

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...

CVE-2026-19135

Affected software: OpenNMS Meridian and Horizon. Vulnerability: A JEXL expression sandbox bypass exists in multiple versions, allowing a low-privileged authenticated user to submit a crafted expression to the Measurements REST API that escapes the sandbox and loads arbitrary Java classes on the s...

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...