CVE-2026-31904

HIGH 7.5

CTEK Chargeportal Improper Restriction of Excessive Authentication Attempts

CVSS Score

7.5

EPSS Score

0.1%

EPSS Percentile

23th

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.

CWE	CWE-307
Vendor	ctek
Product	chargeportal
Published	Mar 20, 2026
Last Updated	Mar 23, 2026

Stay Ahead of the Next One

Get instant alerts for ctek chargeportal

Be the first to know when new high vulnerabilities affecting ctek chargeportal are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

CTEK / Chargeportal

All versions

References

NVD ↗ CVE.org ↗ EPSS Data ↗

cisa.gov: https://www.cisa.gov/news-events/ics-advisories/icsa-26-078-06 github.com: https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-078-06.json ctek.com: https://www.ctek.com/support

Credits

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