CVE-2026-8979 PUBLISHED

Authentication Bypass

Assigner: CyberDanube
Reserved: 19.05.2026 Published: 28.05.2026 Updated: 28.05.2026

The Mennekes Amtron series (firmware versions ≤ 5.22.3) is vulnerable to an authentication bypass. An unauthenticated remote attacker can change the password of the user account via a crafted POST request to the /operator/operator endpoint.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
CVSS Score: 9.3

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

CVSS 4.0

Product Status

Vendor	Mennekes
Product	Amtron
Versions	Default: affected affected from 0 to 5.22.3 (incl.)

Credits

S. Eisenreich-Dietz (CyberDanube) finder

References

https://cyberdanube.com/security-research/multiple-vulnerabilities-in-mennekes-amtron-series/

Problem Types

CWE-287 Improper Authentication CWE

Impacts

CAPEC-115 Authentication Bypass