Siemens Opcenter X up to 2603 JWT Header Validation improper authorization

Summaryinfo

A vulnerability was found in Siemens Opcenter X up to 2603. It has been classified as critical. The affected element is an unknown function of the component JWT Header Validation. Performing a manipulation results in improper authorization. This vulnerability is known as CVE-2026-56451. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Siemens Opcenter X up to 2603. It has been classified as critical. This affects an unknown code block of the component JWT Header Validation. The manipulation with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at cert-portal.siemens.com. This vulnerability is uniquely identified as CVE-2026-56451 since 06/22/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/14/2026). MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

Upgrading to version 2604 eliminates this vulnerability.

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Productinfo

Vendor

• Siemens

Name

• Opcenter X

Version

• 2603

License

• commercial

Website

• Vendor: https://www.siemens.com/

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