Siemens Opcenter X Authentication Bypass Vulnerability (CVE-2026-56451)

Vulnerability Overview Vulnerability Name: Token Invalidation Vulnerability in Opcenter X Before V2604 CVE ID: CVE-2026-56451 CVSS Score: 10.0 (V3.1 and V4.0) Description: A pre-authentication bypass vulnerability exists in Opcenter X prior to version V2604, which allows attackers to obtain fully unauthorized access to the application. Impact Scope Affected Product: Opcenter X Affected Versions: All versions < V2604 Remediation: Upgrade to V2604 or a later version Remediation Specific Steps: Upgrade to V2604 or a later version Related Links: https://support.sw.siemens.com/product/20615970 Additional Information Publication Date: 2026-07-14 Last Updated: 2026-07-14 Current Version: V1.0 CVSS v3.1 Base Score: 10.0 CVSS v4.0 Base Score: 10.0 Vulnerability Description Vulnerability Type: Authentication Bypass Impact: An unauthenticated remote attacker can forge arbitrary JWT types, authorization claims, and impersonate any user, including administrators, thereby gaining fully unauthorized access to the application. CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H CVSS v4.0 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H CWE: CWE-347: Improper Verification of Cryptographic Signature Attachments Contact Information: For more information on security vulnerabilities in Siemens products and solutions, please contact Siemens ProductCERT: https://www.siemens.com/cert/advisories Historical Data V1.0 (2026-07-14): Publication date Terms of Use Usage Conditions: Use of Siemens security advisories is subject to the terms and conditions listed at https://www.siemens.com/productcert/terms-of-use.

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Siemens Opcenter X Authentication Bypass Vulnerability (CVE-2026-56451)