Insufficient Isolation of Authentication Data in CODESYS by CODESYS Group
CVE-2026-0393

6.9MEDIUM

Key Information:

Vendor

Codesys

Status
Visualization
Vendor
CVE Published:
21 May 2026

What is CVE-2026-0393?

The vulnerability allows low privileged visualization users to potentially expose authentication credentials to each other during concurrent login sessions. This issue arises from insufficient isolation of authentication data, which only affects login activities within active visualization sessions, making it crucial for users to be aware of potential security risks in their configurations.

Affected Version(s)

Visualization 1.0.0.0 < 4.10.0.0

References

https://codesys.csaf-tp.certvde.com/.well-known/csaf/whit...
vendor-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Silvan Schweizer from CTA AG
.