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Opcenter X CVE-2026-56451

| EUVDEUVD-2026-43650 CRITICAL
Improper Verification of Cryptographic Signature (CWE-347)
2026-07-14 siemens GHSA-j4h7-9cc4-7f3r
Authentication Bypass Jwt Attack Opcenter X
10.0
CVSS 4.0 · Vendor: siemens
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Severity by source

Vendor (siemens) PRIMARY
10.0 CRITICAL
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
10.0 CRITICAL

Unauthenticated remote JWT forgery (AV:N/AC:L/PR:N/UI:N) bypasses the auth subsystem to control protected resources (S:C) with full admin impersonation, giving C:H/I:H/A:H.

3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Primary rating from Vendor (siemens).

CVSS VectorVendor: siemens

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Jul 14, 2026 - 10:15 vuln.today
CVE Published
Jul 14, 2026 - 09:19 cve.org
CRITICAL 10.0

DescriptionCVE.org

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.

AnalysisAI

Authentication bypass in Siemens Opcenter X (all versions before V2604) lets an unauthenticated remote attacker forge JSON Web Tokens by exploiting improper validation of the algorithm field in the JWT header. Because the application trusts the attacker-controlled 'alg' value, an attacker can craft tokens that impersonate any user - including administrators - yielding full unauthorized access to the manufacturing operations platform. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach Opcenter X auth endpoint
Delivery
Craft JWT with admin claims
Exploit
Manipulate 'alg' header to bypass signature check
Execution
Server accepts forged token
Persist
Authenticate as administrator
Impact
Full unauthorized application access
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Vulnerability AssessmentAI

Exploitation No special conditions - remote unauthenticated exploitation against default configurations of Opcenter X versions prior to V2604, per the CVSS vector AV:N/AC:L/PR:N/UI:N. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine top-priority issue, not a paper-high CVSS. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who can reach the Opcenter X web interface crafts a JWT with an administrator's identity claims and manipulates the header algorithm (e.g., setting 'alg' to 'none' or forcing HMAC verification against a known public key), producing a token the server accepts as valid without a legitimate signature. Presenting this forged token, the attacker authenticates as an administrator and gains full control of the MES platform. …
Remediation Vendor-released patch: Opcenter X V2604 - upgrade all instances to V2604 or later, as this is the version in which the flaw is resolved. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: inventory Siemens Opcenter X systems (identify versions and network exposure) and immediately enforce network segmentation via firewall rules to restrict unauthenticated remote access to trusted management networks only. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-56451 vulnerability details – vuln.today
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