Vulnerability · Published Jul 14, 2026 · Assigned by siemens
CVE-2026-56451
Critical 10.0
In plain English
A critical-severity security flaw in Opcenter X from Siemens. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Siemens | Opcenter X | 0 – before V2604 |
Weakness: CWE-347 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H