CVE-2026-0393Network attack vector

Credential disclosure via insufficient concurrent-session isolation

Published May 21, 2026 · Updated May 21, 2026

Credential exposure in the CODESYS Visualization login dialog before 4.10.0.0 allows remote authenticated users to obtain other users' credentials. The dialog insufficiently isolates authentication data during concurrent logins, allowing one active visualization session to receive credentials entered in another. Exploitation requires low-privileged visualization access and a concurrent victim login through local or remote visualization access; the disclosed impact is limited to credential confidentiality.

CVSS severity5.7
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Credential exposure in the CODESYS Visualization login dialog before 4.10.0.0 allows remote authenticated users to obtain other users' credentials. The dialog insufficiently isolates authentication data during concurrent logins, allowing one active visualization session to receive credentials entered in another. Exploitation requires low-privileged visualization access and a concurrent victim login through local or remote visualization access; the disclosed impact is limited to credential confidentiality.

The record

CVE
CVE-2026-0393
Published
May 21, 2026
Updated
May 21, 2026
Vendor
CODESYS GmbH
Product
CODESYS Visualization
Classifications
CWE-522, T1056
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 2026CVE publishedPublication date reported by the CVE source.
  2. May 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0.0 <4.10.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

CODESYS GmbH · CODESYS Visualizationversion=1.0.0.0 <4.10.0.0

Published CVSS scores

5.7CODESYSCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials
T1056Input Capture

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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