CVE-2026-80304

Authentication bypass via weak HMAC signing key in EYE-SV600 web management interface

CVE CVE-2026-80304
Title Authentication bypass via weak HMAC signing key in EYE-SV600 web management interface
Credits
  • Victor Pasman (DIVD) (analyst)
  • Ian van der Wurff (Tozetta) (finder)
Affected products
Product Affected Unaffected Unknown
Sungrow EYE-SV600 (EyeM4 logger) >= 0 to < 002.00.P029B001 (custom)
everything else
CVSS
Base score 9.3 - CRITICAL
Attack Vector NETWORK
Attack Complexity> LOW
Attack Requirements NONE
Privileges Required NONE
Confidentiality Impact
Vulnerable system HIGH Subsequent systems NONE
Integrity Impact
Vulnerable system HIGH Subsequent systems NONE
Availability Impact
Vulnerable system HIGH Subsequent systems NONE
Safety impact NOT_DEFINED
Automatable NOT_DEFINED
Recovery NOT_DEFINED
Value Density NOT_DEFINED
Vulnerability Response effort NOT_DEFINED
Provider Urgency NOT_DEFINED
References https://csirt.divd.nl/CVE-2026-80304 ( third-party-advisory )
Problem type(s) CWE-1391 Use of Weak Credentials
Impact(s) CAPEC-115 Authentication Bypass
Date published
Last modified

Description

The EYE-SV600 (EyeM4 logger) web management interface uses an HMAC-based request authentication mechanism whose signing key is inadequately secured. An attacker with network access to the device can crack the signing key and forge valid request signatures, bypassing authentication to access protected API functions.

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