CVE-2026-27649 CTEK Chargeportal Insufficient Session Expiration

Medium 6.9 Published 20 Mar 2026 Updated 23 Mar 2026

Attackers can hijack charging station sessions or cause denial of service due to insufficient session expiration and predictable identifiers in the WebSocket backend.

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-2026-27649?

CVE-2026-27649 is a medium-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 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.

Weakness: CWE-613

Which versions are affected by CVE-2026-27649?

It affects 1 product.

Products include Ctek Charge Portal.

How do I fix CVE-2026-27649?

No fix has been published for CVE-2026-27649 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-2026-27649 being exploited?

There is no known exploitation of CVE-2026-27649 in the wild and no public exploit code.

Sources

Also known as GHSA-h5wq-j227-wjwh.