Advisory by Netsparker
Name: Multiple XSS Vulnerabilities in BootstrapValidator
Affected Software : BootstrapValidator
Affected Versions: v0.5.3 and possibly below
Vendor Homepage : 
Vulnerability Type : Cross-site Scripting
Severity : Important
Status : Not Fixed
Netsparker Advisory Reference : NS-15-022

Technical Details
Proof of Concept URLs for XSS in BootstrapValidator v0.5.3:

Vulnerable Page: /bootstrapvalidator-master/demo/target.php

Vulnerable Params: lastName, company, country, phoneNumber, yearDayMonthTime, captcha, username, email, password, fullName, monthDayYear, yearDayMonth, confirmPassword, city, signup2, programs[], languages[], birthday, signup, gender, jobTitle, address, website, firstName, datetimePicker

Attack pattern: '"--></style></scRipt><scRipt>alert(0x009CA0)</scRipt> 

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

Advisory Timeline
04/09/2015 - First Contact
16/11/2015 - Second Contact
15/12/2015 - Advisory Released

Developer did not follow up / no solution is available.

Credits & Authors
These issues have been discovered by Onur Yilmaz while testing Netsparker Web Application Security Scanner.

About Netsparker
Netsparker web application security scanners find and report security flaws and vulnerabilities such as SQL Injection and Cross-site Scripting (XSS) in all websites and web applications, regardless of the platform and technology they are built on. Netsparker scanning engine's unique detection and exploitation techniques allow it to be dead accurate in reporting vulnerabilities, hence it does not report any false positives. The Netsparker web application security scanner is available in two editions; Netsparker Desktop and Netsparker Enterprise. Visit our website for more information.