A vulnerability has been identified in Opcenter X (All versions < V2604). Affected applications do not properly validate the algorithm specified in the JSON Web Token (JWT) header. This could allow an unauthenticated remote attacker to forge arbitrary JWT, bypass authentication mechanisms and impersonate any user including administrative accounts, potentially gaining full unauthorized access to the application.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact High

Subsequent System Availability Impact High

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable yes

Technical Impact total

Affected Vendors & Products

No data.

No data.

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References
Link Providers
https://cert-portal.siemens.com/productcert/html/ssa-096828.html cve-icon
History

Fri, 31 Jul 2026 11:00:00 +0000

Type Values Removed Values Added
Title JWT Algorithm Validation Bypass in Siemens Opcenter X

Tue, 28 Jul 2026 09:30:00 +0000

Type Values Removed Values Added
Title JWT Algorithm Validation Bypass in Siemens Opcenter X

Fri, 24 Jul 2026 07:45:00 +0000

Type Values Removed Values Added
Title JWT Algorithm Validation Bypass in Siemens Opcenter X

Mon, 20 Jul 2026 23:00:00 +0000

Type Values Removed Values Added
Title JWT Algorithm Validation Failure Enables Full Account Takeover in Siemens Opcenter X

Thu, 16 Jul 2026 08:00:00 +0000

Type Values Removed Values Added
Title JWT Algorithm Validation Failure Enables Full Account Takeover in Siemens Opcenter X

Tue, 14 Jul 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Tue, 14 Jul 2026 10:00:00 +0000

Type Values Removed Values Added
Description A vulnerability has been identified in Opcenter X (All versions < V2604). Affected applications do not properly validate the algorithm specified in the JSON Web Token (JWT) header. This could allow an unauthenticated remote attacker to forge arbitrary JWT, bypass authentication mechanisms and impersonate any user including administrative accounts, potentially gaining full unauthorized access to the application.
Weaknesses CWE-347
References
Metrics cvssV3_1

{'score': 10, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'}

cvssV4_0

{'score': 10, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:H/SA:H'}
cve-icon MITRE

Status: PUBLISHED

Assigner: siemens

Published: 2026-07-14T09:19:18.322Z

Updated: 2026-07-14T14:30:15.376Z

Reserved: 2026-06-22T13:17:54.241Z

Link: CVE-2026-56451

cve-icon Vulnrichment

Updated: 2026-07-14T14:26:46.824Z

cve-icon NVD

No data.

cve-icon Redhat

No data.