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Cross-site Scripting (XSS) Vulnerability in WonderCMS

Advisory ID:HTB22759
Vendor:Robert Isoski
Vulnerable Versions:0.3.3 and probably prior
Tested Version:0.3.3
Advisory Publication:December 21, 2010 [without technical details]
Vendor Notification:December 21, 2010
Public Disclosure:January 4, 2011
Latest Update:May 23, 2011
Vulnerability Type:Cross-Site Scripting [CWE-79]
Risk Level:Medium
CVSSv2 Base Score:4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Solution Status:Fixed by Vendor
Discovered and Provided:High-Tech Bridge Security Research Lab

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered vulnerability in WonderCMS which could be exploited to perform cross-site scripting attacks.

1) Cross-site scripting (XSS) vulnerability in WonderCMS
The vulnerability exists due to input sanitation error in the "content" parameter in editText.php. A remote attacker can send a specially crafted HTTP request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website.
Exploitation example:
http://host/editText.php?fieldname=slogan&content=slogan<img src=x onerror=alert("XSS")>

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[1] High-Tech Bridge Advisory HTB22759 - - Cross-site Scripting (XSS) Vulnerability in WonderCMS
[2] WonderCMS - - WonderCMS is the smallest CMS in the world (flat file).
[3] Common Weakness Enumeration (CWE) - - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
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