CODESYS Visualization - Insufficiently Protected Credentials
A vulnerability in the CODESYS Visualization login dialog has been identified. During logins within the CODESYS Visualization, authentication data may not be sufficiently isolated when multiple users perform login operations concurrently. As a result, an authenticated visualization user may be able to obtain credentials entered by another visualization user. The issue affects only login operations within an active visualization session and can be triggered via local and remote access to the visualization.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-0393US | medium6.5 | — | ||
The affected product may expose credentials remotely between low privileged visualization users during concurrent login operations due to insufficient isolation of authentication d… | ||||
references
External citations — patches, advisories, analysis.
- Advisory2026-07_VDE-2026-052: CODESYS Visualization - Insufficiently Protected Credentials - PDFself
- Advisory2026-07_VDE-2026-052: CODESYS Visualization - Insufficiently Protected Credentials - CSAFself
- Advisory2026-07_VDE-2026-052: CODESYS Visualization - Insufficiently Protected Credentials - HTMLself
- CERT@VDE Security Advisories for CODESYS GmbHexternal
- CODESYS Security Advisoriesexternal
remediations (2)
- MitigationCODESYS Visualization
Two alternative mitigation options have been identified. One option is to avoid using the Input Action "User Management -> Login" for changing users within an active visualization session. Instead, use the Input Action "User Management -> Logout" to do a complete logout followed by a new Login to the Visualization to re-login with another user. Alternatively, property handling within the visualization can be disabled via Project Settings -> Visualization -> General -> Advanced -> "Activate property handling in all element properties", if this is not required for the compilation of the application.
- FixedCODESYS Visualization
Update the following product to version 4.10.0.0. * CODESYS Visualization For existing affected CODESYS projects that include a visualization, the fix takes effect only after recompiling the application and performing a new download to the HMI or PLC. The CODESYS Development System and the products available as CODESYS add-ons can be downloaded and installed directly with the CODESYS Installer or be downloaded from the CODESYS Store. Alternatively, as well as for all other products, you will find further information on obtaining the software update in the CODESYS Update area https://www.codesys.com/download/.
Advisories like this name the exposed products attackers go after on your perimeter. See what is exposed on your perimeter with a free passive scan.
Free scan