What is cwbsvstr.exe?

The genuine cwbsvstr.exe file is a software component of IBM iSeries Access for Windows by IBM.
A background process from IBM, the Client Access Express application allows various programs inside Windows to use your Windows credentials for validation and login purposes. Initially released by IBM, this application is now supported by Lenovo. Lenovo maintains support for this file since acquiring the ThinkPad line in 2005.

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the cwbsvstr.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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Cwbsvstr.exe file information

The process known as cwbsvstr.exe belongs to software IBM® iSeries™ Access for Windows by IBM (

Description: Cwbsvstr.exe is not essential for the Windows OS and causes relatively few problems. The file cwbsvstr.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 20,531 bytes (80% of all occurrences) or 20,530 bytes. 
The program has a visible window. The software starts upon Windows startup (see Registry key: MACHINE\Run). It is not a Windows system file. cwbsvstr.exe appears to be a compressed file. Therefore the technical security rating is 22% dangerous; however you should also read the user reviews.

Uninstalling this variant: If you have any problems with cwbsvstr.exe, you can also uninstall the program using the Control Panel ⇒ Uninstall a ProgramIBM iSeries Access for Windows or IBM iSeries Access per Windows.

Recommended: Identify cwbsvstr.exe related errors

External information from Paul Collins:

Important: Some malware camouflages itself as cwbsvstr.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the cwbsvstr.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Part of IBM iSeries Access or the older IBM Client Access
client access for AS400s - not dangerous, if you aren't using AS400s remove it.

Summary: Average user rating of cwbsvstr.exe: based on 3 votes with 2 user comments. One user thinks cwbsvstr.exe is essential for Windows or an installed application. One user thinks it's probably harmless. One user thinks it's neither essential nor dangerous.

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Best practices for resolving cwbsvstr issues

A clean and tidy computer is the key requirement for avoiding problems with cwbsvstr. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the cwbsvstr.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

cwbsvstr.exe [all]