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Category:   Application (Generic)  >   Microsoft SharePoint Vendors:   Microsoft
Microsoft SharePoint Input Validation Flaw Lets Remote Users Conduct Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1041640
SecurityTracker URL:  http://securitytracker.com/id/1041640
CVE Reference:   CVE-2018-8426   (Links to External Site)
Date:  Sep 11 2018
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2010 SP2, 2013 SP1, 2016
Description:   A vulnerability was reported in Microsoft SharePoint. A remote user can conduct cross-site scripting attacks.

The software does not properly filter HTML code from user-supplied input before displaying the input. A remote user can cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the Microsoft SharePoint software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

Ashar Javed of Hyundai AutoEver Europe GmbH reported this vulnerability.

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the Microsoft SharePoint software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
Solution:   The vendor has issued a fix.

The Microsoft advisories are available at:

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8426
https://www.microsoft.com/downloads/details.aspx?familyid=2db6e341-2446-49f7-89ee-1424ba2bb2a7
https://www.microsoft.com/downloads/details.aspx?familyid=d398c474-3d51-476a-8f14-69d8433d60e4
https://www.microsoft.com/downloads/details.aspx?familyid=0aab00b4-2079-465e-9bd2-fcf2f96b4343

Vendor URL:  portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8426 (Links to External Site)
Cause:   Input validation error
Underlying OS:  Windows (2008), Windows (2012)

Message History:   None.


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