EUVD-2026-75707
GHSA-hcpr-9cm8-436x
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
PATCH endpoints carry zero authorization rule so PR:N is confirmed; C:N because no data is read or disclosed; A:L for partial monitoring degradation rather than full service unavailability.
Primary rating from Vendor (OpenNMS).
CVSS VectorVendor: OpenNMS
Lifecycle Timeline
4DescriptionCVE.org
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 and SNMP data collection (which enable and disable event definitions and data-collection sources) are reachable with no authorization enforced. An unauthenticated attacker able to reach the web UI can disable event definitions and SNMP data collection, suppressing event and alarm generation and stopping metric collection - silently degrading monitoring and detection - with the change persisted and reloaded into the running system.
The solution is to upgrade to Horizon 36.0.4 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 2
AnalysisAI
Unauthenticated configuration tampering in OpenNMS Horizon allows any attacker with network reach to the web interface to disable event definitions and SNMP data collection by sending HTTP PATCH requests to unprotected /api/v2 REST API endpoints. The Spring Security authorization policy in applicationContext-spring-security.xml defined intercept-url rules for GET, POST, PUT, and DELETE but omitted PATCH entirely, leaving /api/v2/eventconf/, /api/v2/datacollectionconf/, /api/v2/snmp-config/, and /api/v2/trapd/ open to unauthenticated writes. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must be able to reach the OpenNMS Horizon web interface over the network via HTTP or HTTPS. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.2 score (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L) accurately represents the risk profile: zero-complexity unauthenticated network exploitation with persistent integrity impact and partial availability degradation. … 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 OpenNMS Horizon to version 36.0.4 or newer, which adds explicit ROLE_ADMIN and ROLE_PROVISION authorization requirements for PATCH requests on all affected /api/v2 endpoints and introduces a fail-closed catch-all PATCH rule for the entire /api/v2/** namespace. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all OpenNMS Horizon instances accessible over your network and create baseline documentation of current event definitions and SNMP data collection configurations. …
Sign in for detailed remediation steps and compensating controls.
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External POC / Exploit Code
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