CVE-2026-56451

CRITICAL

Siemens Opcenter X < V2604 - Improper Verification of Cryptographic Signature

Title source: rule

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.

References (1)

Core 1

Core References

https://cert-portal.siemens.com/productcert/html/ssa-096828.html

Scores

CVSS v3 10.0

EPSS 0.0031

EPSS Percentile 22.9%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact total

Details

CWE

CWE-347

Status published

Products (1)

Siemens/Opcenter X < V2604

Published Jul 14, 2026

Tracked Since Jul 14, 2026