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A Velocity template can be provided through Velocity templates in a configset `velocity/` directory or as a parameter. A user defined configset could contain renderable, potentially malicious, templates. Parameter provided templates are disabled by default, but can be enabled by setting `params.resource.loader.enabled` by defining a response writer with that setting set to `true`. Defining a response writer requires configuration API access. Solr 8.4 removed the params resource loader entirely, and only enables the configset-provided template rendering when the configset is `trusted` (has been uploaded by an authenticated user).","epss":{"date":"2026-11-12","epss":0.98567,"percentile":0.99923},"epss_checked":1794522003,"first_seen":1793665375,"kev":{"cveID":"CVE-2019-17558","cwes":["CWE-74"],"dateAdded":"2021-11-03","dueDate":"2022-05-03","forensicTriage":"No","knownRansomwareCampaignUse":"Unknown","notes":"https://nvd.nist.gov/vuln/detail/CVE-2019-17558","product":"Solr","requiredAction":"Apply updates per vendor instructions.","shortDescription":"The Apache Solr VelocityResponseWriter plug-in contains an unspecified vulnerability which can allow for remote code execution.","vendorProject":"Apache","vulnerabilityName":"Apache Solr VelocityResponseWriter Plug-In Remote Code Execution Vulnerability"},"kev_checked":1794522003,"products":"n/a Apache 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