CVE-2026-31904 CTEK Chargeportal Improper Restriction of Excessive Authentication Attempts
Attackers can brute-force credentials or disrupt telemetry via unthrottled WebSocket authentication requests in the CTEK Chargeportal.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-31904?
CVE-2026-31904 is a high-severity authentication bypass vulnerability in CTEK Chargeportal, published on 20 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-307
Which versions are affected by CVE-2026-31904?
It affects 1 product.
Products include Ctek Charge Portal.
How do I fix CVE-2026-31904?
No fix has been published for CVE-2026-31904 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-31904 being exploited?
There is no known exploitation of CVE-2026-31904 in the wild and no public exploit code.
Other vulnerabilities in CTEK Chargeportal
Sources
Also known as GHSA-8gv5-gqxv-v6mq.