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

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至2024.3.12之前版本和2025.0.0至2025.0.9之前版本，以及OpenNMS Horizon 36.0.0至36.0.3之前版本存在授权问题漏洞，该漏洞源于v2 Alarm REST API授权检查不正确，凭据检查受反转条件保护，可能导致低权限用户以任意用户名确认、升级或清除警报，并修改警报状态，破坏警报状态和审计记录的完整性。

CVSS 4.3 · Medium EPSS 0.25% · P15

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-2026-19182

Vulnerability Information
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Vulnerability Title
OpenNMS v2 Alarm REST API inverted authorization check lets ROLE_REST users acknowledge alarms as any user and bypass read-only
Source: CVE Program / CVE List V5
Vulnerability Description
An incorrect authorization check in the v2 Alarm REST API in OpenNMS Meridian and Horizon allows a low-privileged authenticated user (ROLE_REST) to acknowledge, escalate, or clear alarms recorded as an arbitrary username, and, when also assigned ROLE_READONLY, to modify alarm state despite the read-only restriction. A credential check that should restrict these operations is guarded by an inverted condition, so it never executes for a real (non-blank) username. This can potentially allow an attacker to compromise the integrity of alarm state and audit records. 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:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
OpenNMS 授权问题漏洞
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至2024.3.12之前版本和2025.0.0至2025.0.9之前版本，以及OpenNMS Horizon 36.0.0至36.0.3之前版本存在授权问题漏洞，该漏洞源于v2 Alarm REST API授权检查不正确，凭据检查受反转条件保护，可能导致低权限用户以任意用户名确认、升级或清除警报，并修改警报状态，破坏警报状态和审计记录的完整性。
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-2026-19182

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III. Intelligence Information for CVE-2026-19182

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Patches & Fixes for CVE-2026-19182 (1)

IV. Related Vulnerabilities

Same product: Meridian
Same vendor: The OpenNMS Group
Same weakness: CWE-863

V. Comments for CVE-2026-19182

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