Siemens CPCI85 Central Processing-Communication OPC UA Security improper authorization

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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10.0$5k-$25k2.25-

Summaryinfo

A vulnerability was found in Siemens CPCI85 Central Processing-Communication and SICORE Base system. It has been rated as very critical. This affects an unknown function of the component OPC UA Security Handler. This manipulation causes improper authorization. The identification of this vulnerability is CVE-2026-54800. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as very critical was found in Siemens CPCI85 Central Processing-Communication and SICORE Base system (version unknown). Affected by this vulnerability is an unknown function of the component OPC UA Security Handler. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability has been identified in CPCI85 Central Processing/Communication (All versions < V26.20), SICORE Base system (All versions < V26.20.0). The affected application ships with a default configuration that disables all OPC UA security mechanisms. This could allow an attacker to gain unauthorized access and control over critical system functions.

The advisory is shared at cert-portal.siemens.com. This vulnerability is known as CVE-2026-54800 since 06/16/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/09/2026). MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-42595). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 10.0

VulDB Base Score: 10.0
VulDB Temp Score: 10.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper authorization
CWE: CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

06/16/2026 CVE reserved
07/09/2026 +23 days Advisory disclosed
07/09/2026 +0 days VulDB entry created
07/09/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: siemens.com

Advisory: cert-portal.siemens.com
Status: Confirmed

CVE: CVE-2026-54800 (🔒)
GCVE (CVE): GCVE-0-2026-54800
GCVE (VulDB): GCVE-100-377209
EUVD: 🔒

Entryinfo

Created: 07/09/2026 16:38
Updated: 07/09/2026 18:41
Changes: 07/09/2026 16:38 (51), 07/09/2026 18:41 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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