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CVE-2026-56451

Quick assessment

Affected
Siemens Opcenter X
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Siemens Opcenter X是德国Siemens公司的一款工业运营管理和制造执行系统。 Siemens Opcenter X V2604之前版本存在加密问题漏洞，该漏洞源于应用程序未正确验证JSON Web Token (JWT)标头中指定的算法，可能导致未经身份验证的远程攻击者伪造任意JWT，绕过身份验证机制并冒充任何用户（包括管理账户），从而获得对应用程序的完全未授权访问。

CVSS 10.0 · Critical EPSS 0.50% · P40

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
Siemens Opcenter X < V2604 affected
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I. Basic Information for CVE-2026-56451

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Siemens Opcenter X 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Siemens Opcenter X是德国Siemens公司的一款工业运营管理和制造执行系统。 Siemens Opcenter X V2604之前版本存在加密问题漏洞，该漏洞源于应用程序未正确验证JSON Web Token (JWT)标头中指定的算法，可能导致未经身份验证的远程攻击者伪造任意JWT，绕过身份验证机制并冒充任何用户（包括管理账户），从而获得对应用程序的完全未授权访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Siemens Opcenter X 0 ~ V2604 -

II. Public POCs for CVE-2026-56451

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III. Intelligence Information for CVE-2026-56451

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Vendor Advisories for CVE-2026-56451 (1)

Same Patch Batch · Siemens · 2026-07-14 · 3 CVEs total

CVE-2026-54429 7.4 HIGH Siemens simatic s7-plcsim advanced 资源管理错误漏洞
CVE-2025-40945 6.7 MEDIUM Siemens COMOS 权限许可和访问控制问题漏洞

IV. Related Vulnerabilities

Same vendor: Siemens
Same weakness: CWE-347

V. Comments for CVE-2026-56451

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