CISA: CTEK Chargeportal Vulnerabilities Allow Unauthorized Administrative Control
Summary
CISA issued an advisory regarding critical vulnerabilities in CTEK Chargeportal software affecting energy and transportation sectors. Successful exploitation could lead to unauthorized administrative control or denial-of-service attacks on charging stations. The vendor is sunsetting the product in April 2026.
What changed
CISA has issued an advisory (ICSA-26-078-06) detailing critical vulnerabilities in CTEK Chargeportal software, specifically CVE-2026-25192 and CVE-2026-31904. These vulnerabilities, rated with CVSS scores of 9.4 (CRITICAL) and 7.5 (HIGH) respectively, could allow unauthenticated attackers to gain unauthorized administrative control over charging stations, manipulate data, or disrupt services through denial-of-service attacks. The affected product is CTEK Chargeportal, with all versions known to be vulnerable.
While CTEK is sunsetting this product in April 2026, affected entities should contact CTEK for further information and mitigation strategies. Given the critical nature of these vulnerabilities and the potential for widespread disruption in the energy and transportation sectors, organizations using CTEK Chargeportal should prioritize assessing their exposure and implementing any available vendor guidance or compensating controls immediately, despite the product's impending end-of-life.
What to do next
- Contact CTEK for information regarding the product sunset and potential mitigation strategies.
- Assess exposure to CVE-2026-25192 and CVE-2026-31904 in CTEK Chargeportal installations.
- Implement any recommended vendor mitigations or compensating controls.
Source document (simplified)
ICS Advisory
CTEK Chargeportal
Release Date
March 19, 2026
Alert Code ICSA-26-078-06 Related topics: Industrial Control System Vulnerabilities, Industrial Control Systems View CSAF
Summary
Successful exploitation of these vulnerabilities could enable attackers to gain unauthorized administrative control over vulnerable charging stations or disrupt charging services through denial-of-service attacks.
The following versions of CTEK Chargeportal are affected:
- Chargeportal vers:all/*
| CVSS | Vendor | Equipment | Vulnerabilities |
| --- | --- | --- | --- |
| v3 9.4 | CTEK | CTEK Chargeportal | Missing Authentication for Critical Function, Improper Restriction of Excessive Authentication Attempts, Insufficient Session Expiration, Insufficiently Protected Credentials |
Background
- Critical Infrastructure Sectors: Energy, Transportation Systems
- Countries/Areas Deployed: Worldwide
- Company Headquarters Location: Sweden
Vulnerabilities
CVE-2026-25192
WebSocket endpoints lack proper authentication mechanisms, enabling attackers to perform unauthorized station impersonation and manipulate data sent to the backend. An unauthenticated attacker can connect to the OCPP WebSocket endpoint using a known or discovered charging station identifier, then issue or receive OCPP commands as a legitimate charger. Given that no authentication is required, this can lead to privilege escalation, unauthorized control of charging infrastructure, and corruption of charging network data reported to the backend.
Affected Products
CTEK Chargeportal
Vendor:
CTEK Product Version:
CTEK Chargeportal: vers:all/* Product Status:
known_affected
Remediations
Mitigation
CTEK will be sunsetting this product in April 2026. Please contact CTEK for more information https://www.ctek.com/support.
https://www.ctek.com/support
Relevant CWE: CWE-306 Missing Authentication for Critical Function
Metrics
| CVSS Version | Base Score | Base Severity | Vector String |
| --- | --- | --- | --- |
| 3.1 | 9.4 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L |
CVE-2026-31904
The WebSocket Application Programming Interface lacks restrictions on the number of authentication requests. This absence of rate limiting may allow an attacker to conduct denial-of-service attacks by suppressing or mis-routing legitimate charger telemetry, or conduct brute-force attacks to gain unauthorized access.
Affected Products
CTEK Chargeportal
Vendor:
CTEK Product Version:
CTEK Chargeportal: vers:all/* Product Status:
known_affected
Remediations
Mitigation
CTEK will be sunsetting this product in April 2026. Please contact CTEK for more information https://www.ctek.com/support.
https://www.ctek.com/support
Relevant CWE: CWE-307 Improper Restriction of Excessive Authentication Attempts
Metrics
| CVSS Version | Base Score | Base Severity | Vector String |
| --- | --- | --- | --- |
| 3.1 | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
CVE-2026-27649
The WebSocket backend uses charging station identifiers to uniquely associate sessions but allows multiple endpoints to connect using the same session identifier. This implementation results in predictable session identifiers and enables session hijacking or shadowing, where the most recent connection displaces the legitimate charging station and receives backend commands intended for that station. This vulnerability may allow unauthorized users to authenticate as other users or enable a malicious actor to cause a denial-of-service condition by overwhelming the backend with valid session requests.
Affected Products
CTEK Chargeportal
Vendor:
CTEK Product Version:
CTEK Chargeportal: vers:all/* Product Status:
known_affected
Remediations
Mitigation
CTEK will be sunsetting this product in April 2026. Please contact CTEK for more information https://www.ctek.com/support.
https://www.ctek.com/support
Relevant CWE: CWE-613 Insufficient Session Expiration
Metrics
| CVSS Version | Base Score | Base Severity | Vector String |
| --- | --- | --- | --- |
| 3.1 | 7.3 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L |
CVE-2026-28204
Charging station authentication identifiers are publicly accessible via web-based mapping platforms.
Affected Products
CTEK Chargeportal
Vendor:
CTEK Product Version:
CTEK Chargeportal: vers:all/* Product Status:
known_affected
Remediations
Mitigation
CTEK will be sunsetting this product in April 2026. Please contact CTEK for more information https://www.ctek.com/support.
https://www.ctek.com/support
Relevant CWE: CWE-522 Insufficiently Protected Credentials
Metrics
| CVSS Version | Base Score | Base Severity | Vector String |
| --- | --- | --- | --- |
| 3.1 | 6.5 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
Acknowledgments
- Khaled Sarieddine, Mohammad Ali Sayed reported these vulnerabilities to CISA
Legal Notice and Terms of Use
This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy).
Recommended Practices
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities, such as:
Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the Internet.
Locate control system networks and remote devices behind firewalls and isolating them from business networks.
When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.
Revision History
- Initial Release Date: 2026-03-19
| Date | Revision | Summary |
| --- | --- | --- |
| 2026-03-19 | 1 | Initial Publication |
Legal Notice and Terms of Use
This product is provided subject to this Notification and this Privacy & Use policy.
Tags
Sector: Energy Sector, Transportation Systems Sector Topics: Industrial Control System Vulnerabilities, Industrial Control Systems
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