CVE-2020-28390

Password disclosure via exposed web client session storage

Published Jan 12, 2021 · Updated Aug 4, 2024

Credential exposure in Siemens Opcenter Execution Core V8.2 and V8.3 allows local users to read passwords from web client session storage. The application retains passwords for currently logged-in users in Web Client Session Storage without sufficient protection from local access. Exploitation requires low-privileged local access to an Opcenter server and exposes active-session credentials without altering data or interrupting service.

CVSS severity5.5
Medium
EPSS probability0.44%
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 Siemens Opcenter Execution Core V8.2 and V8.3 allows local users to read passwords from web client session storage. The application retains passwords for currently logged-in users in Web Client Session Storage without sufficient protection from local access. Exploitation requires low-privileged local access to an Opcenter server and exposes active-session credentials without altering data or interrupting service.

The record

CVE
CVE-2020-28390
Published
Jan 12, 2021
Updated
Aug 4, 2024
Vendor
Siemens
Product
Opcenter Execution Core
Classifications
CWE-522, T1555
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 12, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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=V8.2
  2. Affected versionversion=V8.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · Opcenter Execution Coreversion=V8.2; version=V8.3

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
2.1NIST NVDAV:L/AC:L/Au:N/C:P/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials
T1555Credentials from Password Stores

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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