osTicket v1.9.15
Maintenance release for osTicket v1.9
=== Enhancements
* Introduce the concept of Trusted Proxies and Local Networks (8ca6bc30)
=== Performance and Security
* Fix memory leak when applying `Use Reply-To Email` ticket filter
* action (8ca6bc30)
* XSS: Sanitize and validate HTTP_X_FORWARDED_FOR header (#3439,
* b794c599)
* XSS: Encode html chars on help desk title/name (#3439, a57de770)