EUVD-2026-75725

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-2026-19596

An XML External Entity (XXE) vulnerability in the XML collector of OpenNMS Meridian and Horizon allows an attacker who can control the XML response collected by OpenNMS (e.g., via a compromised monitored host or HTTP man-in-the-middle) to read files accessible to the OpenNMS service account, incl...

CVE-2026-19596 OpenNMS XML collector XXE allows arbitrary file read from the OpenNMS host

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...