CVE-2009-0783: Apache Tomcat 4.1.0 through 4.1.39, 5.5.0 through 5.5.27, and 6.0.0 through 6.0.18 permits web applications...

Security readout for executives and security teams

Older Apache Tomcat releases allowed one web application to interfere with the XML parser used by other applications. A malicious or untrusted application loaded earlier could read or modify configuration files for other deployed applications. The risk is highest on shared Tomcat hosts or products bundling affected Tomcat versions. Exposure is likely limited to legacy Tomcat deployments, downstream OS packages, or products bundling those Tomcat branches. It matters most where multiple applications share one container and less trusted users can deploy or influence web applications. Prioritize if the organization still runs legacy Tomcat or vendor products embedding old Tomcat. This is not presented as a current mass-exploitation issue, but it can expose or alter application configuration in shared hosting environments. Mitigation focus: Inventory Tomcat versions across standalone servers and bundled products.; Upgrade Tomcat or vendor packages to versions outside the affected ranges.; Check Apache and OS vendor advisories for exact fixed builds..

Prepared

Jun 28, 2026, 10:45 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.