EfficientLab WorkExaminer Professional up to 4.0.0.52001 client-side enforcement of server-side security

Summaryinfo

A vulnerability has been found in EfficientLab WorkExaminer Professional up to 4.0.0.52001 and classified as very critical. This impacts an unknown function. The manipulation leads to client-side enforcement of server-side security. This vulnerability is traded as CVE-2025-10640. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in EfficientLab WorkExaminer Professional up to 4.0.0.52001. It has been rated as very critical. This issue affects an unknown part. The manipulation with an unknown input leads to a client-side enforcement of server-side security vulnerability. Using CWE to declare the problem leads to CWE-602. The product is composed of a server that relies on the client to implement a mechanism that is intended to protect the server. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

An unauthenticated attacker with access to TCP port 12306 of the WorkExaminer server can exploit missing server-side authentication checks to bypass the login prompt in the WorkExaminer Professional console to gain administrative access to the WorkExaminer server and therefore all sensitive monitoring data. This includes monitored screenshots and keystrokes of all users. The WorkExaminer Professional console is used for administrative access to the server. Before access to the console is granted administrators must login. Internally, a custom protocol is used to call a respective stored procedure on the MSSQL database. The return value of the call is not validated on the server-side. Instead it is only validated client-side which allows to bypass authentication.

The weakness was shared by Tobias Niemann. The advisory is shared at r.sec-consult.com. The identification of this vulnerability is CVE-2025-10640 since 09/17/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/21/2025).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• EfficientLab

Name

• WorkExaminer Professional

Version

• 4.0.0.52001

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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