CMS Made Simple 2.2.10 Cross Site Scripting

`=============================================  
MGC ALERT 2019-002  
- Original release date: April 10, 2019  
- Last revised: May 22, 2019  
- Discovered by: Manuel Garcia Cardenas  
- Severity: 4,8/10 (CVSS Base Score)  
- CVE-ID: CVE-2019-11226  
=============================================  
  
I. VULNERABILITY  
-------------------------  
CMS Made Simple 2.2.10 - (Authenticated) Persistent Cross-Site Scripting  
  
II. BACKGROUND  
-------------------------  
CMS Made Simple (CMSMS) is a free, open source (GPL) content management  
system (CMS) to provide developers, programmers and site owners a web-based  
development and administration area.  
  
III. DESCRIPTION  
-------------------------  
Has been detected a Persistent XSS vulnerability in CMS Made Simple, that  
allows the execution of arbitrary HTML/script code to be executed in the  
context of the victim user's browser.  
  
IV. PROOF OF CONCEPT  
-------------------------  
Go to: Content -> Content Manager -> News -> Add Article  
  
And post in the m1_title parameter for example  
test"><script>alert(1)</script>  
  
The variable "m1_title" it is not sanitized, later, if some user visit the  
content in the public area, the XSS is executed, in the response you can  
view:  
  
<input type="text" id="fld1" name="m1_title"  
value="test"><script>alert(1)</script>  
  
V. BUSINESS IMPACT  
-------------------------  
An attacker can execute arbitrary HTML or Javascript code in a targeted  
user's browser, this can leverage to steal sensitive information as user  
credentials, personal data, etc.  
  
VI. SYSTEMS AFFECTED  
-------------------------  
CMS Made Simple <= 2.2.10  
  
VII. SOLUTION  
-------------------------  
Disable until a fix is available, vendor doesn't accept XSS issues inside  
admin panel.  
  
VIII. REFERENCES  
-------------------------  
https://www.cmsmadesimple.org/  
  
IX. CREDITS  
-------------------------  
This vulnerability has been discovered and reported  
by Manuel Garcia Cardenas (advidsec (at) gmail (dot) com).  
  
X. REVISION HISTORY  
-------------------------  
April 10, 2019 1: Initial release  
May 22, 2019 2: Last revision  
  
XI. DISCLOSURE TIMELINE  
-------------------------  
April 10, 2019 1: Vulnerability acquired by Manuel Garcia Cardenas  
April 10, 2019 2: Send to vendor  
April 22, 2019 3: New request, vendor doesn't accept XSS issues inside  
admin panel.  
May 22, 2019 4: Sent to lists  
  
XII. LEGAL NOTICES  
-------------------------  
The information contained within this advisory is supplied "as-is" with no  
warranties or guarantees of fitness of use or otherwise.  
  
XIII. ABOUT  
-------------------------  
Manuel Garcia Cardenas  
Pentester  
  
  
`