Description
An authorized user could upload a template which contained malicious code and accessed sensitive files via an XML External Entity (XXE) attack. The fix to properly handle XML External Entities was applied on the Apache NiFi 1.4.0 release. Users running a prior 1.x release should upgrade to the appropriate release.
Remediation
References
https://nifi.apache.org/security.html#CVE-2017-12623
Related Vulnerabilities
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CVE-2022-26477 Vulnerability in maven package org.apache.systemds:systemds
CVE-2015-7501 Vulnerability in maven package org.apache.commons:commons-collections4