A vulnerability, which was classified as problematic, was found in SiteFusion Application Server up to 6.6.6. This affects an unknown part of the file getextension.php of the component Extension Handler. The manipulation leads to path traversal. The CWE definition for the vulnerability is CWE-22. The weakness was published 01/30/2023 as 67. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2016-15023. The attack needs to be approached within the local network. Technical details are available. There is no exploit available. The price for an exploit might be around USD $0-$5k at the moment. MITRE ATT&CK project uses the attack technique T1006 for this issue. It is declared as not defined. We expect the 0-day to have been worth approximately $0-$5k. Upgrading to version 6.6.7 is able to address this issue. The updated version is ready for download at github.com. The identifier of the patch is 49fff155c303d6cd06ce8f97bba56c9084bf08ac. The bugfix is ready for download at github.com. It is recommended to upgrade the affected component. A possible mitigation has been published even before and not after the disclosure of the vulnerability.