CVE-2026-27649

HIGH 7.3

CTEK Chargeportal Insufficient Session Expiration

CVSS Score

7.3

EPSS Score

0.0%

EPSS Percentile

10th

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.

CWE	CWE-613
Vendor	ctek
Product	chargeportal
Published	Mar 20, 2026
Last Updated	Mar 23, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

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.