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WHMCS Security Advisory for 4.x and 5.x 
http://blog.whmcs.com/?t=76310 
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WHMCS has released new patches for the 4.5, 5.0, 5.1, and 5.2 minor releases. 
These updates provide targeted changes to address security concerns with the 
WHMCS product. You are highly encouraged to update immediately. 
 
WHMCS has rated these updates as including critical or important security 
impacts. Information on security ratings is available at 
http://docs.whmcs.com/Security_Levels. 
 
==Releases== 
The following full-release versions of WHMCS have been published and address all 
known vulnerabilities: 
5.2.6 
 
The latest public releases of WHMCS are available inside our members area at 
https://www.whmcs.com/members/clientarea.php 
 
PLEASE NOTE: The 4.5 series reached End Of Life as of June 30th 2013.  WHMCS is 
aware that some customers have not moved to an LTS version due to the newness of 
the LTS policy.  The related 4.5 patch release published along with this 
Security Advisory is provided as a courtesy to those customers.  From this point 
forward, there will be no more patches provided for 4.5 or any other release 
that has reached EOL. 
 
==Security Issue Information== 
The resolved security issues were identified and reported by 
Vlad C. of NetSec Interactive Solutions  
Rack911  
FastVPS Eesti OU  
WHMCS development team. 
 
There is no reason to believe that these vulnerabilities are known to the 
public. As such, WHMCS will only release limited information regarding the 
vulnerabilities at this time. 
 
Once sufficient time has passed to allow WHMCS customers to update their 
installed software, WHMCS will release additional information regarding the 
nature of the security issue. 
 
These Targeted Security Releases and Patches address 9 vulnerabilities in WHMCS 
versions 4.5, 5.0, .5.1, and 5.2. 
 
==Mitigation== 
 
===WHMCS Version 4.5=== 
Download and apply the appropriate patch files to protect against these 
vulnerabilities. 
 
Patch files for affected versions of the 4.5 series are located on the WHMCS 
site as itemized below. 
 
v4.5.6 (patch only; for 4.5.5): http://go.whmcs.com/174/v456patch 
 
To apply a patch, download the files as indicated above.  Next follow the 
regular upgrade instructions which can be found at 
http://docs.whmcs.com/Upgrading#Performing_an_Upgrade. 
 
===WHMCS Version 5.x=== 
Download and apply the appropriate full-version or patch of WHMCS to protect 
against these vulnerabilities. 
 
Patch files for affected version 5.x are located on the WHMCS site as itemized 
below. A full-version of 5.2.6 is located in the WHMCS member's area download 
section, under your license details. 
 
v5.0.7 (patch only; for 5.0.6): http://go.whmcs.com/178/v507patch 
v5.1.8 (patch only; for 5.1.7): http://go.whmcs.com/182/v518patch 
v5.2.6 (full-version) - Available in the members area @ www.whmcs.com/members 
 
To apply a patch or full-version release, download the files as indicated above. 
 Next follow the regular upgrade instructions which can be found at 
http://docs.whmcs.com/Upgrading#Performing_an_Upgrade. 
 
*This Security Advisory is in the process of being emailed to all active license 
holders.* 
 
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WHMCS Limited 
www.whmcs.com |   
 
 
 
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