Description
In the TransformXML processor of Apache NiFi before 1.15.1 an authenticated user could configure an XSLT file which, if it included malicious external entity calls, may reveal sensitive information.
Remediation
References
http://www.openwall.com/lists/oss-security/2021/12/17/1
https://nifi.apache.org/security.html#1.15.1-vulnerabilities