CVE-2026-31904 PUBLISHED

CTEK Chargeportal Improper Restriction of Excessive Authentication Attempts

Assigner: icscert
Reserved: 12.03.2026 Published: 20.03.2026 Updated: 20.03.2026

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.

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 7.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	CTEK
Product	Chargeportal
Versions	Default: unaffected Version All versions is affected

Workarounds

CTEK will be sunsetting this product in April 2026. Please contact CTEK for more information https://www.ctek.com/support .

Credits

Khaled Sarieddine and Mohammad Ali Sayed reported this vulnerability to CISA. finder

References

Problem Types

CWE-307 CWE