What is cssauth.exe?

The genuine cssauth.exe file is a software component of Client Security Solution by Lenovo.
Preinstalled on most Lenovo machines, the Client Security Solution software runs in the background and starts with Windows. It provides multiple layers of security authentication via passwords and PINs throughout your Windows interface. It can be disabled or removed using the Add/Remove Programs feature in Windows. Founded in 1984, Lenovo is a Chinese PC manufacturer with offices worldwide. In 2005 Lenovo purchased IBM's ThinkPad line.

CSSAuth stands for Client Security Solution Authentication Provider

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 cssauth.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.

Click to Run a Free Scan for cssauth.exe related errors

Cssauth.exe file information

Windows Task Manager with cssauth
Cssauth.exe process in Windows Task Manager

The process known as CSS Authentication Provider belongs to software Client Security Solution or Client Security - Password Manager by Lenovo Group (

Description: Cssauth.exe is not essential for the Windows OS and causes relatively few problems. Cssauth.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 3,089,720 bytes (21% of all occurrences), 2,630,968 bytes and 6 more variants. 
The program has no visible window. The cssauth.exe file is a Verisign signed file. The file has a digital signature. The process is loaded during the Windows boot process (see Registry key: MACHINE\Run). It is not a Windows core file. The process can be uninstalled in the Control Panel. Cssauth.exe is able to record keyboard and mouse inputs and monitor applications. Therefore the technical security rating is 28% dangerous, however you should also read the user reviews.

Uninstalling this variant: The software publisher Lenovo provides direct support ( You could uninstall the program using the Control Panel ⇒ Uninstall a ProgramClient Security - Password Manager or Client Security Solution.

Recommended: Identify cssauth.exe related errors

Important: Some malware camouflages itself as cssauth.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the cssauth.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

cssauth.exe is a process from Client Security Solution by IBM Lenovo and part of ThinkVantage Client Security Solution

Summary: Average user rating of cssauth.exe: based on 1 vote with 1 user comment. One user thinks it's probably harmless.

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Best practices for resolving cssauth issues

A clean and tidy computer is the key requirement for avoiding problems with cssauth. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the cssauth.exe process on your computer, the following programs have proven to be helpful: ASecurity 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. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

cssauth.exe [all]