Some vulnerabilities have been reported in phpRechnung, which can be exploited by malicious people to bypass certain security restrictions.
The vulnerabilities are caused due to e.g. the "CheckUser()", "CheckAdmin()", and "CheckAdminGroup2()" functions in include/phprechnung.inc.php not properly restricting access to users or administrators, which can be exploited to e.g. access certain functionality without being properly authenticated.
The vulnerabilities are reported in versions prior to 1.6.1.
Solution: Update to version 1.6.1.
Provided and/or discovered by: Reported by the vendor.
Original Advisory: http://www.loenshotel.de/phpRechnung/ChangeLog.php
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